catback just includes replacement catylitic converters. The stock H-pipe has 6 cats on it, so do get the cat back system means you go from headers back, and replace those 6 w/ 2. If you don't have emissions and aren't a heavy tree-humper, than just go o/r h-pipe...but if you do, and you want to spend the extra couple hundred, get a catback.
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Current Sophomore -- Mechanical Engineering
Black on Black 98' GT 5-Speed
Mods = Stuff
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