5.9 or 6.7
#3
Registered User
Mine was an air purifier until last Saturday evening. Get the smarty and the deletes, it a whole different animal. I'm running the stock exhaust without the dpf and nox and its not much louder than stock which I like and I'm still running the stock tune. Initially I was VERY nervous about pulling the dpf and reprogramming, but I should have done that right after I bought the truck. Wow what an awesome vehicle, I can't stop driving it now and the grins are HUGE!!!!