When I got my 2-door in 2002, I didn't have time to put the header on, before I went to Moab, so I just brought it along, and changed it in Slick Rock Campground. Well, once I had the header on, I just couldn't resist firing her up, before I reconnected the cat. Sounded like a pissed-off bumblebee... Humorous! Now I need to put something on it other than the stock cat & muffler that's still on it. Spidertrax, on their competition buggy, run some kind of ricer muffler on their 1.6L 16 valve engine.