Blameshift: will catted headers also be non-legal by your MOT rules? (eg. FT86SF or JDL?) Does check involves scrupulous visual check for possible aftermarket parts or just OBD reader for codes & exhaust gases check? There is also option like some here do, pile of aftermarket parts get switched back for MOT check and after passing it back to aftermarket. Not choice for me, as I wouldn't like to do two part switches per year, if nothing else, due need to pay extra for shop's work, due possibly weakening connections/threads and maybe need to buy new gaskets/O2 sensors, if they get damaged during switch, if eg. changing header 6 times per 3 years. I'd consider it if MOT checks had been once per two years though.
P.S. Does torque dip really bother you that much? When everybody was posting about it .. yeah, i checked/saw it, but in real daily driving i usually drive & gearshift at low rpms below dip, at track, or at overtakes when DD, i downshift, and rpms are always above torque dip, 4K-redline. So in reality i don't care about it anymore.
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