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Actually the mileage limit for replacing cats if not damaged on federal OBD2 cars(1996 and up) is now 80,000 miles. Most shops will send you back to the dealer if under that. The Catco cat is very simular to the factory cat internally
so you willnot see an increase in noise over a stoch GM cat. And yes using a WS6 muffler will quiet down the exhaust noise vs the magnaflow cat. Just keep in mind that the V6 cars use 2 1/2" front pipes while the WS6 uses a 2 3/4" pipe swagged up to 3" by the muffler
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