That is only about the homolgation of an engine or vehicle regarding their gas emissions.
Edit: in fact, its like that throughout the European Union from what im reading:
In Portugal you can change a car and present it to homolgation, if it passes then it gets its licence. The changes can be anything that makes the car a different car from what the manufacturer originally made, it applies to the engine as to any other parts of the vehicle, you can be fined for using a different type of tire from what the vehicle licence says.
As for Steorn, well, lets wait some more, if we waited all this time we can wait some longer, right?
PS: are you Portuguese?