Mostly stock. Got a 4" custom, straight exhaust on it and a PPE Hot Xcellerator, along with a couple of them PPE code foolers. I tune it up or down depending on what I'm doing with it. When I'm pulling something heavy-grossing 30,000+-I tune her down to stock or tune 1 to keep from ripping something out of it. Still got plenty of power at that level. When I'm just fooling around, I tune her up! Tuned up, it will absolutley smoke them 4 back tires and that just freaks people out. Looking for a good air cleaner-any suggestions?????