Hi, I just joined the forum, and love all the info on here. I’m not sure where to post this question. I just moved to Meridian, Idaho, from Oregon where diesels are not required to go through emissions. So, I’m not sure what the process is. I have a delete and tune on my ‘11 2500 HD, I have a muffler but no cat. I was wondering if I buy a 4” high flow cat off eBay and install it if that will satisfy the requirements? Any info would be helpful as I got the post card in the mail that I have to go in.