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2006s only had the 5.9 cummins with only a cat an a muffler, the 2007.5 trucks got the new 6.7 cummins with dpfs. So your truck does not have a dpf, you can however get some better performance and mileage by adding turbo back exhaust, i went with rollin smoke diesels 5" straight pipe turbo back, others have turbo back kits with mufflers such as mbrp, flopro, diamond eye, etc
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2006 2500 5.9 RSD 5" turbo back, 7" slash cut tip, Dsport Preadator RKL, silencer ring mia, 18" thumps on 295 Terra grapplers, 2.5" hbs leveling kit, hatchie bottom max 4 custom covers, uniden cb, gutted intake, weatherguard box
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