Look at it this way, Osten. The EU Regulation containing the EU4 requirements necessitated changes to the EU3 M3W - ride height, rear lights, intake manifold, etc. If those changes were not required in order to comply with EU4, why should MMC bother to manufacture vehicles that to the eye of most owners look worse than the EU3? So if those changes are a requirement, MMC/dealers need to demonstrate that reversing them would not breach the Regulation, which requires compliance for the first 20,000km of a vehicle's life. The Police or testing stations may not notice, but if you were to sell the vehicle as EU4 compliant when it is not, you must take the risk - hence my suggestion that you should request sight of a COFC for a modified EU4.
