Originally Posted by 08Mustang
I'm a 4.0 guy so call me biased or not but I will say I prefer the 3.7 exhaust over mine. Catless 4.0s have to be done just right or else they're awful but catless 3.7s sound amazing!! However I will say the 4.0 does have a little more scratchy or raw sound compared to the 3.7s more refined high performance sound.
Yeah that is exactly how i would explain it. The 3.7 sounds like a refined performance sound, and the 4.0 does sound like it is lower pitched and more roary, but it isn't as loud and when you rev it, the rev just doesn't sound as long as the rev of a 3.7