"To our complete surprise, it took only a few minutes for us to completely fall in love with the car. You could say it was a case of love at first sound. The Roush exhaust system completely transforms the character of the Mustang from a pony car to a mean, snarling muscle car. The exhaust sounds fantastic doing just about anything – idling, cruising, downshifting, and, of course, at full throttle. Even while slowing to a stop, the tailpipes emitted a wonderful rumble and burble. A quick visit to the Roush web site revealed that the exhaust system is actually an option and not standard on the 427R, but to us it would be mandatory. Since Roush also sells their parts individually, the exhaust is also available for regular Mustangs. If you've recently purchased a 2010 Mustang GT, go buy the Roush exhaust. No seriously, do it right now. It's worth every penny."
Read the full story: 2010 ROUSH 427R Raises Bar for Mustang Tuners (AutoBlog)