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93 90CSQ Questions (re-post)

A friend of mine has a '93 90CSQ with exhaust problems. Basically, both his
cats have disintegrated and are blocking the exhaust. So:

1) Has anyone replaced the front and/or back mufflers on one of these cars,
or know of a source other than dealer?

2) Anyone know why both cats would be dead? Apparently there is a TSB on the
left cat.

3) How much of this car (2.8 V6) is the same as the A4?

4) Are aftermarket exhausts (e.g. Scorpion, Borla) available for this car?

Rob Winchell
91 200Q
87 4kCS