The EU bureauprats (sorry that should be bureaucrats) plan to outlaw all modifications from standard unless the mods have been thorough the homologation proceedure. That even includes exhaust systems.
I agree Keith. But it is going to be interesting to see how this will be done. We have thousands of vehicles in this country fitted with aftermarket none standard tuning parts. With a multi million pound aftermarket boy racer/modder parts business sector. Bet there is a lot of head scratching going on at the MOT/VOSA.