what are you talking about? you mean a DPF back exhaust? if so, then you are wasting your time and money. Do a DPF delete. H&S sells them for pretty cheap, or find the thread about making your own for 99cents
:ditto::ditto:I think he wanst to just get rid of the dof/cat and leave the OEM downpipe.
You will be ok doing that. That first cat still is restrictive...but you'll be getting rid of the worst parts.
I recommend doing the downpipe as well since the DOC is another form of restriction. If you are just looking for ease od installiation with concerns toward the warranty then the DPF delete pipe would fit you best.no i mean the dpf delete but not the full just the pipe.im wondering how much it would be of a diffrence would it make diffrent if i did the whole down pipe back? or would it make the same as just the pipe