NGK 5238 R5671A-10 3000GT / Stealth Spark Plug Pack of 6

This is a 10 series non projected, non resistor spark plug. This is a great choice for when you are making over 650AWHP on E85 or pushing your gas setup to your limits. It may also help prevent pre-ignition if you do multiple gear long hard pulls. You WILL find it will foul if you do not run the car hard or have your tune spot on. Not suitable if you baby the car. We do not suggest running this unless you REALLY push the car, but it may be needed on a maximum effort E85 car to prevent engine damage.

This plug has a good gap for 15 PSI on stock ignition out of the box, but you may gap as low as .022 depending on your boost level. We find that .025 - .028 is a great starting point once you get in the high teens to mid twenties boost.

Pack of 6 Spark Plugs

Non Resistor
Center Electrode Core Mat