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Yeah flow cats will add volume and some horsepower for sure. If you get long tube headers later on down the road your factory cats would be coming off for sure or any other set of aftermarket high flow cats that work with the stock manifolds. The connection point is totally relocated....most brands of headers offer you either a off road (no cats) or high flow cats connection pipe that would be a custom fit with their headers. A straight pipe generally means no mufflers, so if you hack out your muffler you would be running a straight pipe yes.
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