What makes u think its over boosting? are u blowing head gaskets????
and like the previous guy said start away from the master cylinder and periodically check the fluid make sure your not empty trying to bleed air out with air

yea i have a blown head gasket. i have a oem that havent installed in yet. oh i fix mm brakes already. thanx tho:eek3:

Wel in that case if u are wanting more boost idk what oem is but i would replace it with triple layer copper or steel im no turbo supra guy lol but i do know most factory cars in and around 80's and 90's dont boost much over 5-8 psi i may be oFf on those figures but still in yet i would find a three layer gasket

If an OEM head gasket is installed correctly... I am pretty sure that it will hold up to 12 lbs boost. But the block and the head need to be done correctly...