I want to get a dual exhaust. I saw one on a 87-91 bronco. Is there any place that sells a kit for this? Or do I need to make a custom setup? If I need to do a custom one, does anyone know exactly where to route the exhaust.
Some places offer kits, I've seen them in Jegs but I don't know about your specific app. I just wanted to say, that you should consider manderal bent tube for the exhaust. If you go to most muffler shops, they custom bend pipes for you right there BUT they are NOT manderal bent. A manderal bent pipe does not change in size, if you look at most stock pipes, they get smaller on the inside of the bend and this reduces flow.
Most truck can get away with straight pipes back pretty far, then you could buy some manderal bent pipe from Napa or Jegs and have the rest welded to get around the rear axle or to exit on the sides. Manderal bent pipe are not expensive, I've seen them in Jegs for < $20
On a Bronco it is better to route the exhaust to come out behind the back tires, the same location at the stock exhaust. If you have the pipes come straight out the back and drive with the rear window open, the exhaust will be sucked into the window. Or at least that's what the exhaust shop told me when they put duals on mine. Hope this helps.