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Here in Europe there are serious talks about outlawing N2O-systems that haven't been TüV-tested and approved. Some of these tests include emissions-tests and power-tests, and because of the nature of such systems, it is more likely to get outlawed than an approval. Also, fitting of such systems require (by law) that the maximum effect gained by N2O-injections is to be registered with the vechicle - so if anyone here in Europe fits such a system to their car, it has to be re-registered (and more taxes to be paid in those countries charging taxes on kW's).