Millway Motorsport Underdriven Alternator Pulley for the E30 320iS and M3’s S14 engines.

This billet pulley is larger to result in less parasitic loss from the alternator. Up to 5hp claimed increase.

Longer 935×10 or 935×9.5 belt required (not included).

For fitting instructions, Millway Adjustable Camber Plate, Millway Adjustable Arm, Millway Solid Aluminium Bushing and other Millway parts manuals, please see here.