losses

Hello all! I own a Seat Leon FR 20 VT and after i got my remap done,and I was pleased with the results, I've experience boost presure losses on 5th and 6th gear on high RPM's. Anyone have any ideea why?

just a question it may be nothing but has me thinking got a 1.4 99 plate done 76k never had a problem, needed an exhaust when i got it and a cat to pass its first MOT but other than that been little bits anyway recently over the last few months i have noticed my radiator bottle has been...