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the muffler yes.. the cat... thats up to you... us guys in jersey have to have cats on.. but we just gut the insides so we can say look it got a cat... but its up to you.. striaght pipe in my opioion does more then an exhaust system... because u have nothing holding the power back.. banks is a good exhuast.. but the best thing for your truck.. depending on were u live.. is stright piping the whole thing.. take off the cat and muffler
I'd stay away from Banks. They are way overrated and overpriced. I love my Silverline. It's deep and not as raspy. I had mine straight piped for a while. I liked it at first but I hated the raspyness.