R35 NGK Heat Range 9 Spark Plug

Upgrading to a Heat Range 9 plug (one step colder than stock) is critical for modified R35s. It removes heat from the combustion chamber faster, reducing the risk of pre-ignition and detonation in engines running higher boost or horsepower.

Yes, this NGK Heat Range 9 plug is designed to work perfectly with the R35 GT-R's stock ignition system and coils, requiring no modifications to the coil packs or wiring harness.

These racing plugs typically come with a preset gap (often 0.028″), but we strongly recommend checking and adjusting the gap to your tuner's specific recommendations based on your boost level and fuel type before installation.

Racing plugs generally have a shorter service life than factory iridium plugs. For modified GT-Rs pushing significant power, we recommend inspecting or replacing them every 10,000 to 15,000 miles, or annually for track-dedicated cars.

While physically compatible, using a colder Heat Range 9 plug on a stock, low-load engine may lead to carbon fouling because the plug won't reach its self-cleaning temperature. They are best suited for tuned or driven-hard vehicles.