5.9 Magnum FI cam upgrade

I saw a few people mentioned a "performance computer". Is that something available from Mopar or was that a factory offering on certain models?

Here is one similar to what I put in my 93 Dakota. It provides a more aggressive timing and fuel delivery, bumps the red line from 5500 to over 6000, and gets rid of the top speed limiter. You need to run premium fuel with it though.

http://www.ebay.com/itm/Mopar-Perfo...Parts_Accessories&hash=item19dea80303&vxp=mtr