Curious on how they rate/compare to other cat back systems.
Are they really that loud with stock h pipe?
Is at idle loud or just at WOT?
Does it still retain the Mustang sound or Race car sound?
I want loud and was told SLP are the ones to go with. Advice??? Thanks.
Are they really that loud with stock h pipe?
Is at idle loud or just at WOT?
Does it still retain the Mustang sound or Race car sound?
I want loud and was told SLP are the ones to go with. Advice??? Thanks.

