i just installed greddy headers with megan racing upipe, hks downpipe and borla hush with cobb stage 2 map. after the install took for a test drive and i was running low boost only 8-12psi. i check the vacumm line and there fine. my question is a leak on the headers,uppie downpipe can couse low boost??

 

could be. I don't think that stage 2 map is tuned with a header.

 

any pre-turbo leak would DEFINITELY cause low boost.

 

thats what im thinking

 

Sounds like a leak.
Double check your work.