SCT tuner, the handheld one. It was the Xcal2, it was intake and tuner combo from Brenspeed, it was the one for $659.00. I got the intake and tuner, installed the intake, plugged the tuner into the cars dash, it turned on, it told me to turn the key to on, then it had a place where it listed octane, so I switched mine to 93 and then it loaded it up and then did something else and that was it.

 

Ok you have several tunes for the different octane then. all you do is load that tune and dont touch anything else then.