I just purchased a 97 1500 4x4. The truck is VERY loud. I still see factory manifolds and it looks like the rest of it is pretty stock, but it has dual tips coming out under the rear bumper. I like the look of that but I want to redo the exhaust so it actually sounds halfway decent. I want to get new headers for it i know that much. but what else would i need? i still want a deep sound but i want to have at least a little more gas mileage than what i'm getting now (~85 miles to a half tank) what all do i need? how much pipe? what size pipe? never done exhaust work before.