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1996 993TT Uneven exhaust output

Engine

Vehicle Information: Model: 993 TT; Year: 1996; Body Type: Coupe; Total Mileage: 68,000;

I recently put in new aftermarket mufflers (Fabspeed). The exhaust coming from the right pipe is substantially hotter and greater in volume and velocity than the exhaust exiting the left pipe. I seem to have lost a lot of low end power as well. Some of the power loss is undoubtedly due to the fact that I previously had the car fitted with muff bypass pipes but the loss is so severe that, before the turbos kick in, my TT is now slower than my wife's 964 C2. Any idea what might be causing this?

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