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
Thank you. When i got my stacks put on my truck, they took the muffler off, so the only thing on it is the cat, in which i don't want neither of them on my truck. So i will look into those kits. Thank you guys for the advice.
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