Originally Posted by Tripintaz
Putting the stock intake back on will help. But the most common fix is an EWG.
An EWG is the only fix for a true boost creep/spike. If its poor tuning or the stock bcs issue those can be fixed with well proper tuning and a 3-port solenoid. Porting the IWG can help, but often you will still experience creep if your running an excess of 21 psi (as me how I know). Sounds to me like the OP has a case of unfinished tune. He put a new top mount on, the tuner turned up the boost a bit (since he can now, no more crappy plastic end tanks) and hasn't fully adjusted the WGDC or TD tables to properly achieve targeted boost.