just wondering if you guys would know why am losing psi in 1st and 2nd gear..when i go wot on 1st i don't get full boost, when i get into 2nd gear on wot it goes to 15.4 psi but goes down to 12.6, in 3rd-5th i hold the 15.4psi..anyone know whats going on with my boost...my mods are: turbo xs mbc, gruppe-s header w/flex up pipe, helix dp, apexi gt exhaust...just wondering too would it also be a leak somewhere in my pipes?? thanks for helping...
kevin

 

get a tune and get rid of the MBC

 

i guess i will do that..thanks

 

i had the exact same problem on my 02 wagon. It was when i put my stock bov back on. Boost was leaking out of the BOV so i pulled it off and replaced it with my hks ssqv and it fixxed the problem. So maybe it is leaking from your bov like mine was but i dont know for sure.