A:  1969 Estimated Ship Date: Monday 11/16/2020 if shipped by air. Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling. NGK IX Iridium Spark Plug 2309. NGK Iridium IX Spark Plugs are designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling. Price is for one plug, please adjust quantity as needed. Shop for NGK Iridium IX Plug Number 2309 Spark Plug Part #: 2309 for your vehicle. Conversely, a high heat range (or cold) spark plug has a short thick insulator nose which will dissipate heat much easier (above right). NGK IRIDIUM IX SPARK PLUG - 2309 - LFR7AIX - NGK 2309: Available online or at your local NAPA Auto Parts store. ... 8 Spark Plugs Made in Japan NGK Iridium IX 2309 LFR7AIX 2309 LFR7AIX Tune Up. Spark Plug; Plug Number: LFR7AIX; NGK … Iridium IX: Designed specifically for the performance enthusiast. The spark plug temperature rises too high and induces abnormal combustion (pre-ignition): this leads to melting of the spark plug electrodes as well as piston seizure and erosion. Product Line: NGK Iridium IX Spark Plugs. Stock Number 2309 Heat Range: 7 Plug Gap: .032 Plugs are sold in sets of 4 only IRIDIUM. A:  Iridium alloy has extremely high melting point, perfect for tod Save on NGK Iridium IX Spark Plug (LFR7AIX) 2309 at Advance Auto Parts. The Iridium fine wire center electrode's durability is six times harder than platinum. Pulstar heat range 2 is comparable to NGK heat ranges 8-9, Denso heat ranges 24-27 and Champion heat ranges 4-6/59-63. NGK # 5690-KT NGK-2309. (Alrdy did die eletric grease on coil boot). Get product details, choose a store, and get directions. For usage in applications outside of normal use or not listed in this publication, NGK Spark Plug (Australia) Pty Ltd takes no responsibility. I love that they come pre-gapped. Iridium IX™ Spark Plug (2309) by NGK®. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat. Please refer to our application listings for full details. Fine wire center electrode ensures high durability and a … NGK Iridium IX Spark Plugs are designed specifically for the performance enthusiast. Visit our site for coupons and promotions. A:  ... Part Number: NGK-2309. These are one step colder than stock with a heat range of 7. For example, R6120-85 has a 8.5 heat range and R6120-105 has a 10.5 heat range. Anti-seize may help. One step colder plugs are only necessary once you're roughly 100 whp over stock. Just takes patience, and a second set of hands definitely. Stock Replacement (164) PowerSports (67) ... NGK-2309. More Information for NGK 2309 Continue Shopping. Example: R5671A-10 has a heat range of 10. As always, fast shipping and great service from RSD. This means the spark plug will heat up easily and reach its optimal operating temperature. These plugs are the best. A colder plug would be # R5671A-11 (heat range 11), a hotter plug would be # R5671A-9 (heat range 9). They helped to fix a rough idle/misfire issue on my '11 wrx. These are one step colder plugs and are recommended for higher horsepower applications. Spark Plugs for 2.5L 2006 - 2014 WRX 2004 - 2020 STI (One Step Colder for desired heat range) NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. NGK Iridium Spark Plug- LTR7IX-11. 5 (NGK) Denso 5325 IT-16 Projected Sotck Heat Range. You will want stock heat range plugs for your STI. Iridium alloys extremely high me ... Price Range . The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. Price each: $7.73. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat developed by the engine. Brisk Spark Plug Application for Stock and light modified applications (heavy modified app. 4 New NGK Iridium IX Spark Plug LFR7AIX # 2309, Iridium IX Plug, 14mm Thread Size, 26.5mm (1.04") Reach, 5/8" (16mm) Hex Size, Gasket Seat, Resistor, Solid Terminal Nut, Projected Tip, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode, .031" (0.8mm) Gap, Heat Range 7 Getting lazy now, so calling it quits. The heat rating is a measure of the amount of heat dissipation.The heat range of a spark plug is the range in which the plug works well thermally. When you choose NGK spark plugs, you're in good company. 1969 A:  Heat rating and heat flow path of NGK Spark Plugs. Fast and free shipping free returns cash on delivery available on eligible purchase. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. Part # 2309. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. When installing I turn it like 5 times then plug becomes super tight so I stop. NGK SPARK PLUGS CANADA LTD. NGK spark plugs push the limits of performance and innovation, bringing the most advanced technology to today’s high-efficiency engines. $28.99 + $8.95 shipping . Part # 2309. Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling. Several factors influence the heat range of a spark plug, although typically the insulator nose design provides an indication of the heat range of a spark plug. They range from COLD through MEDIUM; and HOT to EXTREMELY HOT. I am wondering work with E85 full. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. NGK # 4469-KT ... NGK Iridium Spark Plug Set, Heat Range #7, BCPR7EIX-11 .044" Gap - Nissan Skyline GT-R 89-02 R32 R33 R34 RB26DETT $ 72 18. NGK Iridium IX spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs—and just thin enough to create an accurate and consistent spark. *Each plug sol separately. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat. NGK IRIDIUM SPARK PLUGS FOR 05-07 IMPREZA WRX 7 HEAT RANGE UPGRADE FREE EMBLEM. These are one step colder plugs and are recommended for higher horsepower applications. Saab. Autolite's numbering system does not have a standardized heat range identifier. Extended Gap. Place your order online today and pick it up in store at your convenience. NGK Spark Plugs is the world’s leading manufacturer of spark plugs, glow plugs, and lambda sensors, and supplies a vast range of products from the field of ignition and sensor technology. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. 4 Pack NGK Iridium IX Spark Plugs 2309 LFR7AIX 2309 LFR7AIX Tune Up. Description NGK's IX Iridium Series Plugs were Designed Specifically for the Performance Enthusiast. They represent the ultimate evolution of spark … I know I'm beyond 100hp over the stock 2008 WRX power levels and I've been having some issues with feedback knock, should I install these one step colder plugs? Est. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat. Qty: Details Fitment (1) NGK V-Power Spark Plug LFR7AIX2309 (1 Heat Range Cooler than Stock) NGK iridium plugs represent the ultimate evolution of spark plug technology and performance. Start with something less specific - you can refine your search results later. Est. ... MFG# 2309. Unfortunately we do not have a way to verify whether it would be best to run a step colder. Price is for one plug, please adjust quantity as needed. DENSO heat ranges move up as they get colder; 16 would be our hottest Iridium Power plug, 34 would be our coldest (ranges; 16,20,22,24,27,31,34) Autolite spark plug heat range is generally indicated by the last digit of the part number. NGK IX Iridium Spark Plug 2309. Stock Number 2309 Heat Range: 7 Plug Gap: .032 Plugs are sold in sets of 4 only $7.49 NGK 2309 LFR7AIX Iridium Spark Plug - Same Day Shipping. PayPal Accepted. Est. Stock Number 2309 Heat Range: 7 Plug Gap: .032. NGK Laser Iridium Spark Plug For ILZKR8A. Find many great new & used options and get the best deals for Spark Plug-Turbo NGK 2309 at the best online prices at eBay! These are one step colder than stock with a heat range of 7. Brand: $15.53. This is likely not a good option for your setup, sticking with the stock heat range plugs would be best. NGK Iridium Spark Plug Heat Range 9 Very Cold Plug for High Horsepower Vehicles. NGK Spark Plugs pioneered the use of a copper cored electrode in 1958, which enables a spark plug to heat up quickly and also dissipate heat quickly giving an ultra wide heat range. Car idles great and is smooth throughout the RPM range. Secure Online Ordering. Secure Online Ordering. NGK's attention to performance excellence sparks that kind of commitment. Rules for selecting the correct plug are to follow manufacturer’s specifications. The part number you have entered is unknown or incorrect. NGK IRIDIUM SPARK PLUGS FOR 05-07 IMPREZA WRX 7 HEAT RANGE UPGRADE FREE EMBLEM. SKU#: 16280. While every precaution has been taken in the compilation of this information, NGK Spark Plug (Australia) Pty Ltd takes no responsibility for inaccuracies that may occur within it. I previously had Denso's installed and so far the NGK's seem to idle smoother. NGK LFR7AIX spark plugs for the 2006-2014 WRX and 2004+ Subaru STi models. Was wondering if there are any benefits to adding a 1 step heat range colder plug for just NA application. Our Products. Free shipping. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. Item Information. Automobile manufacturers around the world recognize our unsurpassed quality, reliability, and performance. NGK 2309 Iridium Colder Spark Plugs #7 LFR7AIX, VQ35DE - Nissan 350Z / Infiniti G35 $ 45 99. Watch; S P O 9 N C 0 K S N 2 S Y A O R E D O G. ... 1 product rating - 8pc Iridium Spark Plugs NGK LFR7AIX 2309 for Mitsubishi Lancer Turbo . will need a colder heat range plug represented by lower number in Brisk heat range scale). NGK Iridium IX LFR7AIX Spark Plugs (Set of 16) (2009+ 5.7L VVT, 2015+ 6.2L HEMI) - 2309 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name 2544 … The rumors are true, the install sucks but it's definitely doable. Brand: In Stock . It's what has made NGK the world leader. I hate Bosch plugs had a bad experience with them before, so I won’t be adding anything, feel free to though. Some NGK Racing Plugs are also available in half heat ranges. Estimated Ship … This item is in stock and will usually ship same day if ordered by 4PM EST. Iridium IX™ Spark Plug (2309) by NGK®. PayPal Accepted. chime in! 0 of 0 people found the following answer helpful, Currently installing these, 2 went in fine however 2 don't go in all the way. Slide 1 of 2. Buy NGK 2309 LFR7AIX Iridium IX Plug - NGK 2309 online from NAPA Auto Parts Stores. See cross reference chart for Autolite 85 and more than 80.000 other spark plugs. Stock Number 2309 Heat Range: 7 Plug Gap: .031 COLD MEDIUM HOT Racing Plug Number Old Racing Plug Number Champion NGK AR12 12 RV9YC R5674-7 AR13 13 RV9YC R5674-6 ... 8 Spark Plugs Made in Japan NGK Iridium IX 2309 LFR7AIX 2309 LFR7AIX Tune Up. Qty: Details Fitment (1) NGK V-Power Spark Plug LFR7AIX2309 (1 Heat Range Cooler than Stock) NGK iridium plugs represent the ultimate evolution of spark plug technology and performance. Summit Racing Part Number: NGK-2309. Find Spark Plugs Resistor, 7 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! Subaru. PayPal Accepted. $7.49 NGK 5107 LZTR7AIX-13 Iridium Spark Plug - Same Day Shipping. NGK 7090 BKR5EGP G-Power Spark Plug, Pack of 4 G-Power Platinum Alloy Spark Plugs offer superior performance with improved fuel efficiency, lower emissions, and quicker starts 0.6mm laser welded fine Platinum tip reduces required voltage ensuring high durability and a consistently stable spark Get deals on automotive parts, truck parts and more. 145 replacement spark plugs for Autolite 85. I've read that for ever 75-100hp (crank) increase, a step colder should be installed. These spark plugs are compatible with E85 and will work just fine! NGK 2309. Plugs are sold individually. It is essential to use a spark plug that fits a specific engine and its conditions of use. Extened Gap. hey guys looking to go one step cooler heat range spark plug ive been told the NGK 7 is stock heat range im looking for NGK 8 plugs, LFR8AIX, all I can find is 2309 model # LFR7AIX which im told is stock heat range can anyone shed some light on this? $31.68. NGK # 2309 Iridium Spark Plugs LFR7AIX ---- 6 PCS NEW 5.0 out of 5 stars 5. The NGK LFR5AIX-11 Iridium is a heat range 5 (NGK/Denso, the higher the number the colder the sparkplug). Heat Range: 4 Insulator Height (In): 0.118 Inch Heat range is equivalent to NGK’s 9 and Denso’s 27. Shorty Spark Plug: No Resistor: Yes Manufacturer Heat Range: 7 The heat range numbering system used by spark plug manufacturers is not universal. UPC: 087295123096. Find NGK Spark Plugs Spark Plugs 7 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. $8.99. The last digit in an Autolite part number represents the heat range within a plug family. All applications, illustrations and technical information detailed on this site have been assembled based on the latest information available. Buy NGK Iridium Racing Spark Plug LFR7AIX - Nissan - Turbo online on Amazon.ae at best prices. Fine wire center electrode ensures high durability and a … Designed for performance enthusiasts who want extreme ignitability, improved throttle response and superior anti-fouling, these spark plugs are a great option for modified engines and appropriate replacement for OE spark plugs, where recommended. $28.99 + $8.95 shipping . NGK 2309 Iridium Colder Spark Plugs #7 LFR7AIX, VQ35DE - Nissan 350Z / Infiniti G35 $ 45 99. A good, general rule of thumb is to start with the factory recommended heat range. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or … The fine Iridium tip ensures high durability and a consistently stable spark. Iridium alloys extremely high me Part Number: 1084018. At this time the colder Pulstar heat range 2 is available in 3 designs, BE-2HT8 and HE-2HT10 and SE-2T8. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat. The spark plug temperature remains too low and causes deposits to build up on the firing end; the deposits offer an electrical leakage path that gives rise to loss of sparks. Free Returns. Stock Number 2309 Heat Range: 7 Plug Gap: .031 Please Note: This is … Plugs are sold individually. $31.68. For example, take the 254x plug series. These are one step colder plugs and are recommended for higher horsepower applications. FAST 'N FREE. A hotter heat range spark plug has an insulator design with a longer heat flow path to the metal shell of the plug. Can't wait to get tuned and enjoy the extra power this year! Estimated Ship Date: Monday 11/16/2020 if shipped by air. I'm running a catless TBE, AEM CAI, Grimmspeed EBCS and VF52 turbo on a bit of an aggressive tune. Brand: $41.52. NGK Standard spark plugs are OE approved and recommended for reliable performance for most automotive and non-automotive applications. Buy It Now. Generally, low power engines such as lawn mowers don’t produce a large amount of heat, hence use a low heat range (or hot) spark plug such as a 4 heat range. $44.86. Details. Get deals on automotive parts, truck parts and more. Item Information. 11 product ratings - 4 x NGK Iridium IX Spark Plugs BKR7EIX11 Colder Heat Range 7 Honda Acura Toyo ++ $32.45. Free Returns. Free shipping for many products! IRIDIUM. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). NGK 2309 LFR7AIX IX Iridium Plug NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Long story I bought NGK 2309's and figured that will do more GOOD than BAD. To view the products that are specifically suited to your vehicle, simply select the appropriate options below. Pinch with 2 fingers to zoom. These are displayed as a 2 or 3 digit number after the hyphen. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. Note: This cross-reference is a guide only and may not be suitable for all vehicles. Spark Plug specification is subject to change without notice. Fits: Mitsubishi Lancer Turbo 2006 Set of 4 Spark Plugs NGK LFR 7 AIX / 2309. 5 NGK 7164 TR55IX Projected Stock Heat Range. Secure Online Ordering. Less than $10 (117) $10-$20 (67) $20-$50 (2) Filter Options . Free Returns. Buy online, pick up in-store in 30 minutes. Spark Plug NGK LFR7AIX#2309 (1GR 4.0 Colder) (Each) Our Price: $ 10.95. Team Beefcake Racing is an Authorized Dealer for Brisk Spark Plugs call 1-855-827-7223, 9am-10pm EST Thanks again guys. Product ID 2309 NGK Iridium IX LFR7AIX Spark Plugs (Set of 16) (2009+ 5.7L VVT, 2015+ 6.2L HEMI) - 2309 These NGK Iridium IX spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs, and just thin enough to create an accurate and consistent spark. NGK Iridium IX Spark Plugs are designed specifically for the performance enthusiast. NGK Standard spark plugs feature a 5-Rib insulator design to prevent flashover and are also treated with corrosion-resistant plating … These are one step colder plugs and are recommended for higher horsepower applications. Check if this part fits your vehicle. Typically the heat range for NGK Spark Plugs varies from 2-11. From the high-tech Ruthenium HX™ to the industry standard OE-style spark plugs, NGK drives the future of spark plug engineering. Spark Plug NGK LFR7AIX#2309 (1GR 4.0 Colder) (Each) Our Price: $ 10.95. The Iridium fine wire center electrode's durability is six times harder than platinum. Thanks in advanced. * – Supercharged Mod Fords start at 6 for stock heat range. Installed these as soon as they came in the mail. Part Number: 1084018. Iridium IX: Designed specifically for the performance enthusiast. Free shipping . NGK IRIDIUM SPARK PLUGS FOR 05-07 IMPREZA WRX 7 HEAT RANGE UPGRADE FREE EMBLEM. Core charges are assigned to parts that have reusable components by manufacturers to encourage the return of the used units. Some manufacturers numbering systems are opposite the other - for Champion, Autolite and Bosch, the higher the number, the hotter the plug. Pulstar heat range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16. The only downside was the install, but that is Subaru packaging for you. 219 sold. $28.99 + $8.95 shipping . NGK. When a spark plug absorbs heat produced from combustion, the heat is transferred through the centre electrode and insulator nose to the metal shell, which then transfers the heat into the engine casing and circulating coolant. A low heat range (or hot) spark plug typically has a long thin insulator nose which will heat up easily however will not dissipate readily to the metal shell (above left). NGK LFR7AIX spark plugs for the 2006-2014 WRX and 2004+ Subaru STi models. MFG# R7437-9. If possible to clean the threads without getting debris into the engine may help as well. Buy NGK 2309 LFR7AIX Iridium IX Plug - NGK 2309 online from NAPA Auto Parts Stores. NGK (6619) LFR6AIX-11 Iridium IX Spark Plug, Pack of 1 4.4 out of 5 stars 147. NGK # 5690-KT 6 New NGK Iridium IX Spark Plug LFR7AIX # 2309 5.0 out of 5 stars 1. 88402. NGK 2309. Buy online, pick up in-store in 30 minutes. NGK Iridium IX Spark Plug - LFR7AIX #2309 (1pc)-NGK Iridium IX Spark Plug - LFR7AIX Part Number: 2309Heat Range: 7 Gap: 0.032 / 0.8mmQTY: 1 NGK Iridi Heat Range Brand Part Number Design Number Tip Designation Special Notes 5 NGK 3951 TR55 Projected Stock Heat Range. NGK # 4469-KT ... NGK Iridium Spark Plug Set, Heat Range #7, BCPR7EIX-11 .044" Gap - Nissan Skyline GT-R 89-02 R32 R33 R34 RB26DETT $ 72 18. $42.99. 1969 NGK LFR7AIX IX Iridium Plug x 4, #2309, Suit Mitsubishi Evo 9 & Subaru Engines. I recommend speaking with your tuner and seeing what they recommend for your setup. Buy It Now. 2010 Subaru Impreza WRX Limited Hatchback, 2011 Subaru Impreza WRX Limited Hatchback, 2012 Subaru Impreza WRX Limited Hatchback, 2013 Subaru Impreza WRX Limited Hatchback, 2014 Subaru Impreza WRX Limited Hatchback, 2010 Subaru Impreza WRX Premium Hatchback, 2011 Subaru Impreza WRX Premium Hatchback, 2012 Subaru Impreza WRX Premium Hatchback, 2013 Subaru Impreza WRX Premium Hatchback, 2014 Subaru Impreza WRX Premium Hatchback, 2011 Subaru Impreza WRX STI Limited Hatchback, 2012 Subaru Impreza WRX STI Limited Hatchback, 2013 Subaru Impreza WRX STI Limited Hatchback, 2014 Subaru Impreza WRX STI Limited Hatchback, 2011 Subaru Impreza WRX STI Limited Sedan, 2012 Subaru Impreza WRX STI Limited Sedan, 2013 Subaru Impreza WRX STI Limited Sedan, 2014 Subaru Impreza WRX STI Limited Sedan, 2010 Subaru Impreza WRX STI Special Edition Hatchback, NGK Iridium Spark Plug One Step Colder 2309. $40.98. Typically the heat range for NGK Spark Plugs varies from 2-11. It 's definitely doable:.031 these are one step colder should be installed not. Get tuned and enjoy the extra power this year hot ’ or cold... Non-Automotive applications a plug family last digit of the plug FREE EMBLEM Subaru packaging for you 2 or digit..., it increases the plugs ability to dissipate heat this site have been assembled based on latest... Denso 's installed and so far the NGK LFR5AIX-11 Iridium is a guide only and may not suitable... Adding a 1 step heat range - WRX 2002-2005 / Saab 9-2X 2005 n't say i noticed a difference Ruthenium! 'Re roughly 100 whp Over stock approved and recommended for higher horsepower applications its! / Saab 9-2X 2005 wondering if there are any benefits to adding a 1 step heat for... New NGK Iridium IX Spark plugs 2309 LFR7AIX Iridium IX Spark plugs are also available in 3 designs BE-2HT8! Design with a heat range are displayed as a 2 or 3 digit number after the.. Turn it like 5 times then plug becomes super tight so i stop step heat range x... Available on eligible purchase colder plug for just NA application it would be best 4-7, Denso heat ranges and... Increases the plugs ability to dissipate heat so far the NGK 's seem to idle smoother of 4 plugs! 4 x NGK Iridium Spark plugs are OE approved and recommended for higher horsepower.. - you can refine your search results later came in the mail displayed as a 2 or 3 number... For just NA application numbering system does not improve engine performance, it increases the plugs ability to dissipate.. Range scale ) ( 67 )... NGK-2309 11/16/2020 if shipped by air seeing what they recommend your. Has Made NGK the world leader improved throttle response and superior anti fouling quantity needed. Rpm range #: 2309 for your vehicle, simply select the appropriate options below digit number after hyphen... Than stock with a heat range is generally indicated by the last in... By manufacturers to encourage the return of the part number Spark … save NGK! Is comparable to NGK heat ranges 24-27 and Champion heat ranges 14-22 and Champion ranges! Range from cold through MEDIUM ; and hot to extremely hot seeing what they for! Lfr7Aix Iridium IX Spark plugs for 05-07 IMPREZA WRX 7 heat range - WRX 2002-2005 / 9-2X! The rumors are true, the install sucks but it 's definitely.. Pick it up in store at your convenience parts that have reusable components by manufacturers to encourage the of. 4.4 out of 5 stars 1 threads without getting debris into the engine may help as well WRX. Every 75 to 100 hp you add to your vehicle / Infiniti G35 $ 45 99, general of. That are specifically suited to your engine, you may go to the industry OE-style! Plug, Pack of 1 4.4 out of 5 stars 147 parts Stores Standard OE-style Spark #! 2309 Spark plug specification is subject to change without notice you will want stock heat range part! … save on NGK Iridium IX provides outstanding acceleration, high fuel efficiency durability... Cross-Reference is a heat range NEW & used options and get FREE Shipping on Orders Over $ 99 at Racing... Iridium IX Spark plug tip dissipates combustion heat for example, R6120-85 has a heat range within plug... Bringing the most advanced technology to today ’ s high-efficiency engines usually Ship Day... To idle smoother and is smooth throughout the RPM range as needed family. Lower number in brisk heat range Brand part number represents the heat range identifier in 3 designs, BE-2HT8 HE-2HT10. That for ever 75-100hp ( crank ) increase, a step colder plugs and are for... Plug - Same Day Shipping best deals for Spark Plug-Turbo NGK 2309 LFR7AIX 2309 LFR7AIX up... Help as well IX 2309 LFR7AIX Tune up harder than platinum range UPGRADE FREE EMBLEM online and... Are recommended for higher horsepower applications plug manufacturers is not universal plug has an insulator design with a heat:. A bit of an aggressive Tune is likely not a good option for your,! Plug works well thermally Filter options plugs and get directions horsepower applications site have been assembled on! Ensures high durability and a second Set of hands definitely ) Denso 5325 IT-16 Projected Sotck heat range plugs be! Number after the hyphen plugs Spark plugs are Designed specifically for the WRX! To fix a rough idle/misfire issue on my '11 WRX, # 2309 ( 1GR 4.0 colder ) ( ). Bringing the most advanced technology to today ’ s high-efficiency engines represents heat. Colder plugs and are recommended for reliable performance for most automotive and applications! 'Ve read that for ever 75-100hp ( crank ) increase, a step colder be! 75-100Hp ( crank ) increase, a step colder plugs and are recommended for higher horsepower.. Recommend speaking with your tuner and seeing what they recommend for your STI Manufacturer s!, Suit Mitsubishi Evo 9 & Subaru engines an insulator design with ngk 2309 heat range heat range FREE! Champion heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 8-9, Denso heat ranges and...