Here's a lightweight alternator pulley to reduce rotating mass from your engine. Precision CNC'd from aircraft grade billet aluminum this is a normal diameter spec unit and not underdrive. Installation does not require different length belt, and will not affect aftermarket supercharger installations.
A 100 gram paper-light billet aluminum version of the steel OEM alternator pulley that lets the motor spin more freely. Complete your pulley set for a show quality engine bay. Fits Mk2, Mk3 and Mk4 12 Valve VR6 VW engines and 2.0L 4 cylinder engines and replaces P/N 021-903-119 (021903119)
