Borla's cat-back sytem for the 4.0L I-6 is P/N 14836. It is a converter-back system and comes with everything needed for installation. I opted to have a muffler shop I use do the work. The stock system was nicely rusted and I don't own a torch (or a lift). My only complaint is the "bling" exhaust tip. It is WAY too big for practical trail use. It will be coming off when I build a custom rear bumper.