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I imagine its gonna be the usual manufacturers. Corsa will have the least drone and probably the quietest right there with the magnaflow. The GMPP is probably made by borla. I think the GMPP exhaust for the c6 is made by borla. The next step up will be Borla just slightly louder than the GMPP. The loudest will be the SLp of course or for those looking for the extreme, straight pipes or cutouts like on the 4th gen. I like it loud so I'll probably just drive down to the local muffler shop and have him cut the mufflers off and weld up some pipes. I did that with my c-6 and it sounds awesome. I've had straight pipes on just about every car I've had. Sounds good to me.. Oh, and for those that have never had a flowmaster, its like riding around with the muffler in your lap. The interior drone is terrible, plus they don't sound that good on ls1 motors, IMO. They sound good when you start them up and idle, but when you hit the higher rpm's it sound like its blowing air. It's like it loses its sound at higher rpms.
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