Originally Posted by GNEn!st

sat im out driving and when i start to do highway pulls i c my boost gauge creep up to 20lbs.. i have the boost controller set at 15. it would usually spike at 20 and hold at 15 now it spikes comes down to 15psi and gradually goes back up...what could be the prob?

mods:
intake
3"dp
3" exhaust
14b
ported stock manifold