I dont know what difference it makes. All I know is that I cut out the cat then the muff. And the change was barely audible with just the cat out. I would take it out anyway, turn it in for the core and go buy somethin else for your truck!!!!!!
Living and driving the Pittsburgh, and wheeling, WV areas there are lots of tunnels, there is nothing cooler than laying on it in a tunnel, I think it actually p'o's the cars, of coarse it isn't as bad as some Harleys runnin straight pipes
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