Good luck with that, First thing they will do is check to see if its had a dodgy map, if so goodbye warranty and hello big bill. All of this is the exact reason i would take my car to a tuner to have a remap done and get hold of a shark handheld or REVO STS thing if i wanted to have control of maps.Well my car is under warrenty, if anything goes tits up ill remove it and take it back and let the garage sort out the mess lol.