Well, here's my 2 cents!
I've had the PV1 catback with the "wheezonator" tip. Way too loud, bad inside drone & sounded like a ricer (untill the "wheezonator " kicked in and made it sound like something was about to blow up or out). Interestingly, nocturnalVX's & Anita's PV1 catback does not sound like what I had.
Put back the stock muffler on till I tried the Aeroturbine. Much better sound, lower with no interior drone. Seemed to feel close to the same power increase on the high end. Still a bit louder than what I care for.
Back to the stock muffler.