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I had FRPP GTA's installed. I am very pleased. Very quiet at idle and low rev's, yet about 3000+ RPM or when you get on it you have a nice muscle car sound
I drove a 2007 GT with Roush mufflers (I believe they are rebadged Borla Stingers). Anyway, they sounded great!...but the drone was very annoying in that 1800-2000 RPM range.