Active Autowerke E9X M3 Supercharger Kit Gen 2 Level 2The advanced design and sleek features of the Active Autowerke Supercharger System include a front mount air to air intercooler system with a separate oil cooler for the supercharger unit's independent oil system. The Active Autowerke Supercharger Plenum replaces the factory air box and is designed to have an OEM type look with custom finishes available at the customer's request. The Active Autowerke Supercharger Plenum has been designed with eight