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993 resonance

Engine

Vehicle Information: Year: 95; Body Type: Coupe; Total Mileage: 50k;

i just bought a 95 coupe with tiptronic trans, fabspeed exhaust and a chip. there is a loud annoying resonance inside the car at 2200-3000 rpm where i seem to drive most of the time. it sounds like intake sound. there are no leaks in the exhaust and the air box is stock. the car is quiet when it is cold. 3-4 minutes after a cold start it gets loud and stays there unless i let it cool down for an hour or so. a local shop said it is unique to the 95 before the varioram came in 96 but had no suggestions for a solution. any ideas?

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