If these EC proposals go ahead it will have serious implications for a lot of us,as well as the whole car modifying industry.
Scary stuff!
The Commission proposes to introduce a definition for a roadworthiness test that components of the vehicle must comply with characteristics at the time of first registration.
This may prevent most modifications to vehicles without further approval of the vehicle. (this will apply to many components and to all types of vehicle)
http://www.the-ace.org.uk/armageddon/#more-901