Duals just don't look right on a diesel unless they're stacks and I don't see stacks going on any excursions. I mean the duals that banks and some other companies have are okay but I personally think on a pickup it should exit out one side to get all that sound together, and not all chopped up. I passed a duramax this morning with duals and it sounded stupid. I wanted to smack the guy! It didn't even sound like a diesel, it just had an annoying hum to it as I passed - I mean roared by. Think of it this way. We have two exhaust manifolds and they both have to go through the turbo ya know. Just buy a kit from magnaflow or the company of your choice. I bought a 4 magnaflow for mine and it sounds really really good when I get on it. It fit together perfectly and took about 40 minutes to put on myself! Plus it'll flow so much better than some hole in the wall exhaust shop job....just my piece of mind.....