Listen to how this sounds after it goes by and grabs the next gear. Its deep, loud, but......mellow, NOT raspy. This is my MRT catted H with Super 44's and stock manifolds.
YouTube - 2004 Cobra Exhaust Clip flyby #2 Flowmaster/MRT
That is a real good tone. I have a o/r x and lm1's and it is nasty. Sometimes I wish it was a deeper more mellow tone. It's just right around 2500 where it gets raspy but at WOT it is just amazing.