I am going to be buying some mufflers for my car and I don't want anything loud but I do want the best performance I can get at the same time. I like the sound of hemi mufflers like those on my 70 GTX so if their performance compared to whatever the quietest aftermsrket performance mufflers are wasn't that much different, I would go that route. If there is a significant difference I will go with whatever the quietest aftermarket performance mufflers are that are available.