Not sure of the year model application, but Gibson makes an affordable cat-back system. Check with Summit Racing or Jeg's. Also try a forum search for "exhaust", some of the threads have pics of Bronco owner's set-ups. I have a single highflow cat with a si/do Flowmaster 40 series muffler. I would suggest routing the exhaust out the right side behind the tire, or at least at a 45 deg. angle by the rear bumper. If you run the pipes straight back, you can get alot of fumes in the cab with the hardtop on.