Not to steer you away from here, but there is another forum with the word cummins in the name that you will have a lot better chance at getting advice. The diesel part of this forum doesn't have a lot of traffic as you can see. It's great for almost everything else thought.
Ive heard good things about ATS.
2007 6.7 | EFI-Live | Draconian tuned TCM | T4 S366 | ARP | AFE | Fox | Carli