Internal Mods for Forced Induction?on e30 325

[kerrigan244]

was wondering what i would have to do to the motor to get it to handel 10 to 15 psi ? and about how many hp it would have

[SwolenColen]

you'll need to lower compression.. thicker headgasket / dished pistons, id go w/ the pistons... you may need a forged crank from a 524td if u want to rev high at 15 psi... stock rods are fine, new injectors (42# from lightnings are good), something for ur a/f ratio like a rising rate reg., pump, piggyback, etc. and you might want to o-ring ur headgasket for protection... u don't really need to do that tho, especially if ur lowering compression if u do it right you shouldn't have ne knock.