I have a 2.5" Flowmaster Delta 50 (update - actually a Super 44). It's loud as stink at speed but sounds great at idle - a nice, throaty, snorty burble for a V6. At full throttle over 3500 rpm it's a little bit coffee-can sounding from inside, but I have no idea what it sounds like from outside.
I found that it gave a significant boost to low-rpm torque as well.
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