Hello, was driving my car today and noticed when changing from 3rd gear to fourth the car pulled another 1000revs during change up and also rose in boost pressure to 1.2 bar!!! it has never done this b4 (normally drops down revs not goes up) and it only seems to be doing it during this gear change the car is a 2001tip tt with exhaust and headers plus ecu flash to 1bar. is this something to do with the gearbox (like clutch slipping) has anyone heard of this PLEASE HELP!!!