AG Diesel Solutions Module
The heart of this upgrade is the AG Diesel Solutions Performance Module (chip). I installed one on my last coach (Cummins 5.9L Common Rail) and it made a big difference in the performance curves, especially acceleration. Your 8.3L CAPS should see an increase of 20% HP, and you will get a 5-10% increase in fuel economy depending upon how you drive.
If you do this, please report back.