8.1 496 cats
05-07-2007, 12:43 PM
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8.1 496 cats well i just got duals put on my 8.1 2500hd chevy pickup and they go from the cats back. Now i just realized that the 8.1 doesnt use rear 02's behind the cats. i know removing them will make it louder but will it help performance? if not i will just leave them on. opinions?
