this car is sweet. its the audi 5000 cs turbo. its got the winter package and its the olympic edition. i have chrome on the bottoms of my doors which is totally sick.

what i need to konw... once my car hits about 3500 to 4500 rpms and 1.6 bar it goes flat, ive been told its my wastegate? or i could have a cloged fuel filter or cadilidic converter? which is it? thanks