Arrow Part Number - 71718MI

Note This ARROW Racing 4:2:1 Collector unit is designed to be used with any of the ARROW Slip-on Silencers [Race-Tech / Pro-Race / GP2] designed for this model.

Or alternatively, the O.E. silencer can be retained.

• Made from INOX Stainless Steel [AISI 304 grade] for a durable lightweight item that allows performance gains.
• This Racing collector system is supplied with provision for the O.E. exhaust sensor mounting points (2).

Technical Note: The BMW Original Equipment Collectors unit has a fixed exhaust valve attached.

When replacing this O.E. unit with an Arrow Racing Collector #71718MI, the exhaust valve will be eliminated.

The BMW On-Board Diagnostic System (EOBD) will display a warning message due to the exhaust valve malfunction [removal]

and the ECU can / will enter a 'Recovery Mode' status.

Therefore, when installing the Arrow Collector, it is strongly recommended to remap the ECU with

a 'Deactivating Exhaust Valve function' map.

Or alternatively, purchase and install an After Market 'Exhaust Valve Emulator System'.