well awhile i ago i shimmed my wastegate by two shims. And a week after i had that my turbo started to whine really bad, but about a month ago, i started to run Open Downpipe, and since then the whine is no longer existing, and i was actually holding boost. before when the whine would come on my boost gauge would drop to zero, not boosting. Could it possibly be just because it was so restrictive with the Cat and the Exhaust there?