The high performance single air filters are made of multi-layer cotton, treated wafer-thin with special filter oil they have up to 40% more air permeability compared to a paper filter.
This one-off purchase saves the constant costs of conventional filters and thus also protects the environment. Fuel consumption can be reduced and engine performance increased thanks to the higher air flow.
Registration Air filter (single air filter):
-are subject to registration
-as a rule, a power and noise measurement is required
-There are no certificates for them, registration must be done by individual approval.
-From 1989 onwards, an exhaust emission certificate is required. This is theoretically possible, but due to the
but not in practice due to the extremely high costs.
Individual filters (K&N or DNA) can be registered by individual approval. The requirements for this depend on the respective inspection authority and can vary greatly in terms of both effort and cost. As a rule, a performance and noise measurement is required. This requires a vehicle that is ready to drive and otherwise in a state suitable for registration.
