Well i noticed that noone has a aero turbine muffler on there 4.2L yet so im going to be going in the next week or two to get 1 installed. Going to do a few muffler swaps between various flow masters and aero mufflers + a few others to see what it sounds like. I heard the aero on a SS in another post here and it just sounds mean. Obviously never going to get that sound from a 6 cylinder but maybe it sounds nice. Anyone here have aero muffler?