Worst case you can use a reducer, or you can get a 2 1/2 inch cat with a 2 1/2-3 inch adapter. Why are you looking for a 3inch cat? Anything under 300-325HP a 2 1/2" is plenty and 3" may be too much for a lower powered engine. Depends on your overall plans for the car.
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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