Cumminstuner's CSP Tuning are the best tuning calibrations for your Cummins with a built transmission. We use EFILive tuning software and years of tuning experience to make sure your truck runs like no other. Our CSP tunes allow you to switch your tunes on the fly! No more stopping to switch tunes or waiting for tunes to load. You can change tunes while driving your truck. Purchase the CSP switch and all you will have to do to change tunes is turn a knob! It's as easy as changing your radio station. Imagine, going from 330 rwhp to 500+ rwhp with the turn of a knob!