Wagner Tuning BMW F8x M2/M3/M4 S55 Charge Pipe Kit57mm (2,25 Inch) Charge Pipe Kit for BMW F87 M2 Competition F80 M3 F82 F83 M4 with S55 EngineImportant product features: compared to the OEM Charge Pipes, the WAGNER system has a larger flow diameter and no innumerable internal cross sectional changes, as can be found in the OEM product this results in 40% less back pressure, which relieves the turbocharger and at the same time ensures better response behavior (see Flow Bench graphic below) our WAGNER