It most certainly will void the warranty. I am an automotive engineer. Engineering is a process of balancing and compromising, engine calibration in particular. The stock calibration is a balance of power, torque, longevity, emission, fuel consumption, cost, and many other factors. For manufacturer to make a change, there have to be DV (Design Validation) and PV (Production Validation), each comprises of a long list of comprehensive tests. The rule of unintended consequences dictates that even if this chip could boost power as it claims (and that is a big IF), it may screw up a number of other things.