NASCAR Mike
Full Access Members
When I installed my JMS Boostmax which gives me 5 additional lbs of boost on 93 octane, I installed NGK Iridium 6510 spark plugs. They are one heat range colder than the factory plugs and I gapped them to .028. They cost me $9.99 each but Advanced Auto always has 20% off coupons when you order online.
Mustang owners use this same exact plug in boosted 5.0 coyote engines that push 700HP so they will withstand our 400+ HP tunes.
Mustang owners use this same exact plug in boosted 5.0 coyote engines that push 700HP so they will withstand our 400+ HP tunes.
