I went from the gt500s to the Roush ABs for more volume since I was staying with the stock pipes. I personally love the Roush. Loud when you get on it and quiet when cruising. No drone whatsoever - well unless you are going about 90 mph.
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2014 Ford Mustang GT (aka "Vivian") - M6 Stripper. Mods: Strut Tower Brace; Roush ABs; 18" by 10" SVE Drifts with 285 Nitto NT555s.
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