I know every one says it's garbage and isn't as free flowing as other exhaust systems such as Borla Stingers, Magnaflow, or MacPerformance. But, I still think flowmaster sounds the best on the fourth generation Mustangs. I've heard some mean sounding flowmasters on the MACH1 and Terminators. Nowadays, people are tired of the flowmasters sounds and looking for something different. I still love it and going to stay with it.