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  1. I drive a 2008 Dodge Ram 3500 Cummins. It has a 4-inch lift, Mud Grippers that are 35's, stock exhaust, no chip or delete. What would be better to do for better fuel mileage, should I just put a chip in it or put in cold air intake, straight pipe it, take the catalytic converter off? Or if you have any better ideas, please help.
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