Unless they have changed
Unless ATR has changed the way they do the down pipes your going to have to figure how to connect it to your exhaust. If your using the cat you'll have to make up a flange and cut the pipe and install the flange. If your using the late model exhaust if you can get a gutted cat or go cat less you won't have to cut much at all. Mine runs through a 86-87 exhaust using a gutted cat. I ran it completely through it with about a 1"going in the Y-pipe and I still had to cut 3"off. if you go catless you'll just have to mate it to the exhaust. This was two years ago and maybe it's different. Don't cut untill you have everything in place. Give your self plenty of time to work on it.