How much would it run me to have the factory muffler on my 07 dodge Durango 4.7 cut off and a glasspack welded in its place

Best to speak to them and ask if they would install your part and if your not sure it's legal they would also help you with that

You would have to ask them also is it legal

Yeah, best bet would be to call down and talk to them about it.

Yiu might want to call them and ask them