You could...in theory....I read this on the internet...if your handy with a welder
Order a pre-bent “muffler delete pipe” for a 2001-2005 off eBay, cut the factory pipe just behind the 4 bolt flange and a couple inches behind the DPF, clamp or weld the muffler delete pipe onto the factory 3.5” just behind the flange, then on the other end weld on a 3.5” to 4” adapter, and weld that to a short piece of flared 4” pipe, (adapter, 4” pipe and clamps available at any commercial truck parts house) which will slip over and clamp onto the remaining factory tail pipe...or you could weld that too just depends on if you need to put it back stock for inspection. I’m in Kentucky and as long as it will roll down the road under its own power and has 1 working brake light your pretty much good to go haha:haha: As far as sound with DPF removed, it’s not much louder than stock. Somebody that knows these trucks would know it’s not stock but I think the average person wouldn’t. It has a nice low rumble and I’ve not towed with it yet but it doesn’t seem to have any drone either.