Originally Posted by turboDA6

check for leaks in the manifold... look for dark black area's cuz those are representing exhaust leaks. exhaust leaks can act as a wastegate at lower rpm's thus creating laggy boost. try this... disconnect the vaccume to the wastegate and take off down the street. it should spool up hella fast and u should get full boost around 2.5 to 3 if not then try to adjust the wastegate actuater arm to shorten it. it might be stuck in an open posistion thus leakin at lower rpm having to close at higher then re-opening to create ur "set psi"... it sounds confusing but jus try it. thats what was happening to me til i got my external wastegate now i get full boost at 2k and im lovin it. only thing im not lovin is i have no dump tube yet and my engine bay is gettin dirtyyyy