If you’re driving with the windows closed, the cabin does a good job of suppressing the violence that is coming out the tailpipes. Drive with the windows down under an overpass, and give it some gas……lol.
@oddjack ..... there are some great youtube videos of before and after sound bites of Mustang two pipe vs 4 pipe and Mustang 4 pipe versus Corsa, Valvetronic etc. I believe the Valvetronic website has some sound comparisons if you "google" it