We run Impulse spec CP pistons, no head shim, 9:2 compression, we run at sea level.
Our Raptor we ran 11:1, 24psi at seal level on E85
Holy crap that is awesome you can run that much boost and compression at sea level on E85! Wonder what you could do at high elevation? Does Paul have any interest in E85 for us snowmobilers? Is E85 a more powerfull/better fuel then race fuel?