Hey Guys, Rob (smurfin) sent this over to me so that I could add some more information into the thread.
The SCT X-Calibrator V2 is the ultimate flash tuning device. It can read / clear trouble codes, datalog with a wideband like the LC-1, and hold multiple tunes.
A custom 91-93 octane performance tune from us will give you an addtional 7-12 hp and 7-12tq at the wheels. It will also slightly increase gas mileage. A gas mileage tune from us will give you 1-2 mpg better gas mileage and there will be no loss of power at WOT (wide open throttle).
Along with the increase in power you will also recieve increased throttle response(greatly improved for 05+ electronic throttle cars), firmer faster shifting(for automatics) a raised rev limiter, removed speed limiter, and your engine fan will be commanded to come on at a lower temperature so that your car runs cooler - helps get rid of that bogged down feeling in traffic for instance.
There are also several other things we do in the tunes to help increase the overall performance of the vehicle. We have tuned 100's of V6 Mustangs which gives us the experience necessary to safely tune your vehicle to its full potential.
Pretty much everything else that Rob said was right on the mark.
If you guys have any questions feel free to post in here, send me an email or call.