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Parts store discount, colder for smaller pulley
One stage colder plugs
Installed by:Pro Installer
The spark plug upgrade really does help it. Sure not by a lot but you can tell it is a improvement over the stock plugs
Official sparkplug of NASCAR!
Premium Iridium plugs - 2 heat ranges colder than stock
Some would suggest Iridium is not ideal for high compression and they may be right...