Active Autowerke Test Pipes BMW E9X M3 11-01911 019 Made of 100% Brushed stainless steel it bolts right up to the factory exhaust headers and provides a tight seal with the new set of TORCA clamps that are also included with the Test Pipe kit. The Test Pipes features a ** Z STYLE ** expansion slot at the rear of the Test Pipe to provide that tight exhaust gas seal with the help of the European designed TORCA style clamps. These clamps are strong and robust with the beefiest in band width, a 14