I like my GT500's. I wish they were a tad louder (O/R H-pipe will fix that), but the tone and rumble is perfect.
If you do plan on swapping out H-pipes or catless, then be very leery of certain axlebacks. When you start messing with more exhaust parts they tend to get incredibly loud. The Roush's get alot of complaints once you start doing more exhaust work.
2012 Race Red GT Premium | MT82 3.31 | HID/Security | Steeda CAI | BAMA 91P | JLT Seperator | Steeda Shift Bracket | Steeda ProAction Shocks/Struts | Steeda Heavy Duty Strut Mounts | Eibach Pro-Kit (Dub) | J&M Adj. Panhard | GT500 Axle-Backs w/Resonator Delete | Ford Racing STB | American Muscle GT500 Black Machined 18x9/10 Nitto 555