Active Motorwerks provides performance upgrades like engine kits and air intakes to increase power for BMW diesel and petrol engines. They also offer accessories like a carbon fiber and Alcantara BMW M logo key wallet for hardcore fans of the performance division. The company discusses BMW and Mini automakers who make more than just small cars. Upgrades mentioned for a BMW M4 include iND painted reflectors and badges. Carbon fiber shift paddles and a gear shift lever cover are also mentioned as enhancing the M Performance interior, along with floor mats. The document discusses some customers' concerns about after-sales service of imported vehicles.