I started building this 02 cummins 2500 the day I bought it. Cleaning it up and building it up to what it is today. I started out with one superchips programmer and a 4 inch straight exhaust to twin 6 inch MBRP 45 miter cut stacks. Then I stacked chips and added a rhino lined bed and a ranch hand headache rack. Now I have personally sanded and rhino lined the bottom of the pickup. And Now I only have one single black six inch stack with a cold air AFE intake and a bored and smoothed intake and plenum. She pours smoke and will pull a house down.