Always something new.. In 1999 I had a new noble brock spin/gasifier on it at the Camaro (5.7) because the original carburettor was broken as well as fan manifolds with side exhaust system. Fan manifolds with exhaust were registered at the time including the changed stand/driving noise. Spider/gasifier did not consider that the TÜV at that time was not necessary: -only replacement parts, since no original air filter was installed -in his opinion no significant performance In 2022 I wanted to, since it did not work last year and under another a workshop near Munich probably had no desire for my car and did not want to support me in obtaining the H-approval because you can choose the customers, then take care of the H number. After consultation with a TÜV examiner the registration would also be no problem in relation to the “H” since 20 years ago a However, because of the increase in performance that the car comes to a test bench. This worries me basically because I don’t know if the engine/gear unit will survive such a test run. The engine, or the car is technically fit, but the engine has never been dismantled and has been completely overhauled since it has been running very well so far. Do I worry about this for no reason and is that not a problem at all? I also wonder if the test run really has to be built, original air filter box and contemporary. In the letter anyway only the “ca.” indication is in it. Is there experience values how much extra power spider/carburettor/cavity curvature really bring?