any one having any probs with the mk3 software a mate at the track to day with x12 17.5 had over heating problems all day untill the speedy packed it in tried gearing it different with no luck went from one extreme to the other retarted timing on the engine. engine would not go a lap without overheating but was on par with other cars on the track performance it was good. should mention that mk2 ran fine temp wise