Yea Alex take it back with shell fuel in lol, they said they could probably get to 335-340 with better fuel in but I've had it tuned on what I can get and after 340 you need to start looking for a bigger turbo. Don't get too caught up on the peak bhp figures though, the torque increase is huge and the gains though the midrange can really be felt. Also it sounds amazing now I can hear the turbo :)