Join Date: May 2018
Location: we live in a high mountain valley in the hi country of northern arizona
I deny everything - just "what I have heard"...….just "hypothetically speaking" if I did a "full delete", so that my DPF and CAT are now safely stored...……..I would chose 4" for the reasons stated in the above posts.
The exhaust kit that came with my "hypothetical" delete kit did have a muffler - standard "straight thru". Was fairly quiet, but not quiet enough. Had a ( again, hypothetical speaking.....!) 2nd "straight thru" muffler installed - much quieter - now almost as quiet as "stock". Yes, you could get it as quiet as stock, but then you'd have some back-pressure. I do not know if a modern big 4" truck muffler with baffles would add significantly to "back pressure" - guess whether it is significant would depend on what you use your truck for.
2013 3500 long bed crew cab. Purchased at approx. 80,000; now have 91,000, convert to CP3. DPF "triggerd" a limp mode, so was cut out of the vehicle & cleaned by a DPF cleaning co., on re-installation, everything back to normal. Would never ever think of something as nasty and as anti bunny wabbet as a full-delete...after all..dosnt everyone like the fun & excitement of being stuck by the side of a Interstate in the ran while towing when one's truck's computer decides to go into "limp mode"...?.