I've got one of the Predator tuners that I use on my 06. It has three preset tunes for 87 octane, 91 octane and 93 octane. In addition it has a section to reset the EECIV parameters. You can remap the fuel curve, reset the timing. change shift points on the transmission, reset the RPM limiters, disable the speed limiter, set the idle speed and a host of other options. Just follow the directions in the owners manual .