Spark Plug NGK LFR7AIX#2309 (1GR 4.0 Colder) (Each) Our Price: $ 10.95. I hate Bosch plugs had a bad experience with them before, so I won’t be adding anything, feel free to though. Long story I bought NGK 2309's and figured that will do more GOOD than BAD. Can't wait to get tuned and enjoy the extra power this year! The NGK LFR5AIX-11 Iridium is a heat range 5 (NGK/Denso, the higher the number the colder the sparkplug). COLD MEDIUM HOT Racing Plug Number Old Racing Plug Number Champion NGK AR12 12 RV9YC R5674-7 AR13 13 RV9YC R5674-6 These are one step colder plugs and are recommended for higher horsepower applications. SKU#: 16280. NGK # 5690-KT Iridium alloys extremely high me Summit Racing Part Number: NGK-2309. ... 8 Spark Plugs Made in Japan NGK Iridium IX 2309 LFR7AIX 2309 LFR7AIX Tune Up. 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. I previously had Denso's installed and so far the NGK's seem to idle smoother. Free Returns. NGK 2309 Iridium Colder Spark Plugs #7 LFR7AIX, VQ35DE - Nissan 350Z / Infiniti G35 $ 45 99. PayPal Accepted. Brand: In Stock . Estimated Ship Date: Monday 11/16/2020 if shipped by air. Slide 1 of 2. 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 . A good, general rule of thumb is to start with the factory recommended heat range. Iridium IX: Designed specifically for the performance enthusiast. Note: This cross-reference is a guide only and may not be suitable for all vehicles. This item is in stock and will usually ship same day if ordered by 4PM EST. 88402. $28.99 + $8.95 shipping . Details. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat. Details. 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. 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. 1969 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. chime in! 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 2309: SKU # 88402: Weight: 0.12lbs: Ground Electrode Design: Tapered: Gap - Factory Preset: 0.8 mm = 0.032 in: Metal Type: Iridium: Ground Electrode Configuration: Single: Ground Electrode Material: Nickel Alloy: Electrical Terminal Type: Non-Removable Nut: Heat Range: 7: Reach (in) 1.04: Center Electrode Tip Material: Iridium: Center Electrode Core Material: Copper: Resistor: Yes When installing I turn it like 5 times then plug becomes super tight so I stop. You will want stock heat range plugs for your STI. ... 8 Spark Plugs Made in Japan NGK Iridium IX 2309 LFR7AIX 2309 LFR7AIX Tune Up. *Each plug sol separately. Buy online, pick up in-store in 30 minutes. 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. For example, R6120-85 has a 8.5 heat range and R6120-105 has a 10.5 heat range. 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 6 New NGK Iridium IX Spark Plug LFR7AIX # 2309 5.0 out of 5 stars 1. Secure Online Ordering. NGK Iridium Spark Plug- LTR7IX-11. Brisk Spark Plug Application for Stock and light modified applications (heavy modified app. Is smooth throughout the RPM range colder step NGK Standard Spark plugs Made in Japan NGK IX! 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