I have a 4.8 and put dinan exhaust on my baby. The sound is just music to my ears---power difference...honestly not much, plus i have Dinan CAI and throttle body which added a little power. If you are willing to spend the money it worth it. Some people argue the look of the 4.8 exahust is better looking--i agree but not much differnece to me...and did i mention the sound yet?