I have recently rolled over 305k, and im about to change out plugs, injectors, and exhaust, Im looking for performance, gas is not a problem unless it drops dont to half of what stock is lol, I have a 4.8l whoretec. I am looking for a free flow high pitched exhaust, nothing that racks the mufflers ( Im not the common redneck). Thank you!

 

Magnaflow, spintech, aero chamber are 3 off the top of my head. Here YouTube can be your friend