hi I own a 95 mk3 gti 8v.I got a new set of alloy wheels with tyres the size 16inch 205 50.nangkang. good make.but since I have put the alloys on I hav noticed a big decrease in the power of the car both low down and at high end.before the new alloys the take of speed was good ,but now it feels less responsive than before.the alloys before were standard gti 15inch. I thought if I put 17 or 18 inch wheels it would have made a differance ,but not 16. has any1 noticed this before???