I was woundering about boost i have a mbc and it is turned all the way up but it wont let me boost past 19. I have full exaust does any body know why that is?

 

03, its possible your mbc isnt hooked up right since peak boost on our cars stock is approx 19psi. full exhaust wont determine your boost to a drastic amount(although it can up the boost a psi or two due to more free flow and turbo being able to spin faster with less resistance.) when installing a MBC be extremely careful with it. It is not recommended without a proper tune. I only speak for myself when i say this but i'd say the absolute max psi with a tune and turboback but not changing pump/injectors is 21 or 22psi SAFELY.