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I have a 96 f250 with the 460 (2wd). I'm looking to get more mpg's. Would removing the cat and replacing it with a straight pipe and keeping the rest of the stock exhaust including the muffler benefit me? What about noise? I don't want uncomfortable noise levels inside the cab. The rest of the truck is stock other than the removal of the horns on the intake, and the advancement of the timing to 12 degrees.