Motor tuning and performance enhancements have a long tradition at AC Schnitzer. In order to ensure that you are on the safe side, we refrain from achieving the maximum possible performance and thus achieve a higher stability, which means a higher durability of the engine. Many of our performance enhancements are therefore designed to increase the torque rather than the horsepower output. The torque is what you feel when you are pressed into the "seats", for example, when you start off. 6 good reasons for AC Schnitzer's performance increases experience For 30 years AC Schnitzer has been exclusively refining BMW brand vehicles Tested AC Schnitzer performance enhancements are subjected to extensive test series on race tracks, test benches and in daily field service. These test series last up to 9 months and several 10,000 km. Simply Additional control unit for increased performance. Original plugs guarantee a short workshop stay. Resource-oriented AC Schnitzer performance enhancements are designed for maximum stability. Securely The start-up and high speed ranges remain at the standard production level. All BMW protection systems remain fully functional. guarantee AC Schnitzer warranty for 2 years from the initial registration of the vehicle.