Looks kinda sketch. I know that with HPTuners (The VCM scanner part of it actually) you can increase timing and change the AFR (things that increase gas mileage/power) without changing the tune, but doing so increases your chance of knock and leaning it out which is very bad if you plan on going full throttle. the ebay ad says it interfaces through the OBDII port, is that correct? because thats how the VCM scanner connects.