I removed and installed all FOUR mufflers on my 2011 Dodge Challenger R/T and am 100% satisfied with the performance and sound. I have no idea what's up with people complaining about the "roar" of these cars. It's much quieter than my 2002 Mustang GT and has the same setup except for the lack of catalytic converters. Maybe a part of society is softening? I do not know. Anyway, this muffler sounds great on my car and I did the same on my 2005 Silverado with the 5.3 liter engine. It sounds great on it too. Five stars again for the Flowmaster. Nothing beats the Flowmaster. Nothing.