[rukkee]

Nope it's a hand held tuner that your can flash back and forth between stock and their performance tune . It's been dynoed at 288whp and 311Wtq. It also had a code reader /clearer and data logging capabilities. It's can be updated over the net and once you remove the tune from your car it can tune quite a few other GM car's and gas and diesel trucks. So when you want to move on to a different tune ....just flash your car back to stock and sell it. I bought my cortex used and it works flawlessly .

I really like mine. I use it as an extra gauge that monitors IAT temps , timing , fuel trims and maf lb/min . There are many more you can watch but only 4 at a time.