Hey man i bought my Diablo Sport Predator Tuner from foxperformance. they dont sell them anymore but it was 299.99 including shipping. I used to have a Diablo Chip that i had tuned from this place (
http://www.concoursdirect.com/99muv8prpr.html ) and they sell diablo sport predator for 399.99 including shipping and they give you for free the pc interface kit to hook up to PC and the wall adaptor so you can plug it in outside of the car.
you can not borrow diablo sport predators because you must download your original tune from car and upload the Performance one to car, there for the car and the tuner get "married'
How it works is, you plug it in your diagnostics port on the driver side where the console meets the dash.
After plugged in, it boots up and gives you a menus and instructions on how to tune and turn off the check engine light for example if you have a Off road xpipe, advance timming, fuel air mixture.... etc etc. all you have to do is follow along, plus the manual tells you what to do as well.
Not very hard i did my car in like 15min max. and along with the offroad xpipe i installed the predator and that dropped me .4 sec on 1/4 time.