They came with 4 cats. 2 rear and 2 upstream with oxygen sensors monitoring them. There was one resonator and one muffler. Check my youtube channel for videos demonstrating my setup. http://www.youtube.com/user/TekMan05?feature=mhum
I removed the rear cats with a dual in/out Flowmaster muffler with 2.5'' piping back. Also where the cats are is galvanized piping in its place with caps I can have on or off. It adds more of a nasty louder sound getting it closer to a open headers sound. Eventually I may have to modify the dumps when I plan on installing high flow cats in the front and an X-pipe somewhere ralong the mid pipe area.
thanks for the info...i think with that cap that when you open it its just like a big exhaust leak...you are most likely losing power....i know a website that sells a electric exhaust cutout that would be way better
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