Bottlenecking the system might help, but isn't he running the stock catback?EWG is the answer..lol
how dangerous is 20psi anyway?
would running the stock catback make boost creep better or worse? I would think worse because there is less room for the wastegate exhaust to get out.
on the other hand if you aren't getting as much exhaust flow maybe it won't creep up as fast to start with