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Well, the most important critereon is power. Most aftermarket mufflers harm performance. MFI systems are particularly sensitive to mufflers. I would put cost and longevity next. That obvioulsy leaves out B&B. Stainless lasts longer but costs more.
I agree the mb911 thread is interesteing and he migh make single in mufflers for you guys next - esp. if you convince him there is a market.
BTW, I have a Monty dual in/out - it has some rasp (good) but the main impression is a deep throaty roar. This is listening on the engine dyno. My hope is that it will not resonate in the car (Actually, my main hope is that I get it IN the car).
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