Hello, for a few weeks (time is not definable, since I don’t always drive around like a poacher) I have a (subjective) power loss. At least it seems to me that my 225 quattro with WKR chip currently has significantly less power than it was 4-6 weeks ago. Sure, now winter tires are on it – but can they alone cause a really noticeable power difference? This whistles and roars without end – but Audi didn’t change it during the inspection… I should have explicitly stated – they usually don’t know their own cars. Normally my TT always went through with flat and dry road and full throttle in the second gear. This happens now with the same road situation rather rarely. In addition, just looking against a BMW 325i relatively bad (though faster, but only rather light). But also my subjective impressions tell me: something is not right. Therefore, my question: what else could be the causes of such a loss of performance? Thank you for all the tips!