Dinan Free Flow Axle-Back Exhaust | F87 M2 | 3.0L Turbo I6 [N55] 8P A3 3.2L VR6 The O2 sensor bungs are

The O2 sensor bungs are located higher up on the ARM downpipe to avoid stretching the O2 sensor wires during installation

A constant ram air supply is forced in from the grille inlet

This unique compact design incorporates a drum style e-brake into the rotor for a clean functional solution

making installation easily completed at any APR dealer or in your own garage

To put this into perspective a Walbro 450 flows about 318lph at 70 psi

Dinan Free Flow Axle-Back Exhaust | F87 M2 | 3.0L Turbo I6 [N55] 8P A3 3.2L VR6 The O2 sensor bungs areThe aggressiveness of a track exhaust and the refinement expected of a daily driver all wrapped into one is what many desire but find hard to acquire. This 'white whale' of a product just became easier to locate with Dinan's M2 Free Flow exhaust system that utilizes the factory exhaust valve in concert with Dinan's muffler design to allow for this Jekyll and Hyde ability. Dinan's Free Flow Axle Back exhaust system features 100% stainless steel