Which plugs, fuel, boost ? It will vary but from my personal experience on E85/30psi with NGK 95770 I have them at .025 most guys with 97506 are running .022So I just changed all of my plugs and gapped them to .020. Literally like 100miles ago. Now I'm saying screw it and i want to order this kit. When I install it, would I need to buy new plugs and widen the gap or just leave them and let it work it's magic? I'd rather not spend the extra $80 on top of $530.