on not 15-20 psi on stock internals at most 10-12 psi on stock internals, with upgraded internals 15-20 psi before it gets sleeved and rebuilt for more. and for you mid life crisis jackasses I was refering to the jack assess that are in a vette or some equally shitty domestic, now if you want to lower your car, that you have put work into and tricked out, into the same category as a stock vette or cobra then you may not be slow on the street but in the head. I've got nuthin against old fuckers my dad is helping me with my crx and we are also working on an 80 elcamino, holy shit did I just admit I am working on a domestic, yes a chevy, a car with the time and effort needs to be appreciated no matter how old the jackass driving it is. but if you think your car is fast because you paid for the little pony on the front grill and the only mod you did was to add a cd holder on your visor then you deserve to get blown away by a jap rice burner, or even a turbo wagon( with the wife and kids driving on the road lookin like chevy chase in lampoons vacation)