I finnaly installed my restrictor plate, it cut down the exaust from 2.5 inches to 1.25 inches, the throttle response is crappy but now i can go full throttle. Its still boosting to high 1 bar but its better then 1.5. i can't wait to go full throttle in 4th or 5th.

P.S. im running a straight pipe and it did not really quiet it down that much.