Remus:

The Remus Exhaust System features a straight through muffler, reducing backpressure by an amazing 63%. Remus mufflers reduce exhaust weight by 10 lbs., while still showing an increase of 10 horsepower on the dyno. No need to worry about fitment; as Remus mufflers will fit your M3 PERFECTLY, and use same mounting points as stock. All Remus Mufflers are constructed from 303 stainless steel to ensure your exhaust never rusts and lasts as long as your vehicle will. Give your E90/E92 M3 that deep, aggressive Remus exhaust note, while not being overly loud, with a perfect fitting Remus Exhaust. Available in Axle-Back, Cat Back and Full Race Header Back Configurations to suit.