I was wanting to know if anyone just did the DPF delete and kept using the DEF? Does anything beneficial actually come from using the DEF? Is it better to just remove it and the cat from the exhaust altogether? I'm about to do the delete and tune with H&S, but haven't decided on whether to keep the DEF system or just delete it. Obviously its cheaper to just remove the DPF and leave the cat alone. I already have the tuner and the catback exhaust sitting in my garage. I wasn't sure if I should just leave it and use it, unplug the DEF and remove the tank or go ahead remove the cat too. To be fair I have 18000 miles on the truck and have yet to have any problems with the DEF, just problems with too frequent regens, about every 200 miles or less. I don't have the time or patience to let the local dealership try and figure out the regen problem, just works better for me to just remove it and just be done with it. Thanks

U can leave the Cat/DOC/Urea in place but the H&S tune will still shut it off. No options to specify.

Thanks good to know, might as well get rid of that too!

I am straight piped, I didn't get a new down pipe but I did do a cat/dpf delete. At cruising speed it is just a little rumble but you get on the throttle you get alot of turbo noise. Most people wouldn't want it that loud. I had the cat in place for the first month and it still has alot of turbo noise but just quieter. If you wanted just rumble you would probably need some sort of a muffler/resonator.

The SCR and DPF are a combined unit. (delete dpf and the scr is gone as well). Without the SCR section, the chemical reaction to eliminate the NOx will not happen - therefore if you are deleting the dpf/scr then the def injection might as well be disabled as well.

GM expanation of system:

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