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The Perrin Lightweight Alternator Pulley is a CNC-machined 6061-T6 billet aluminum replacement for the stock alternator pulley on 2021-2025 Subaru Outback XT and 2022-2025 Outback and Outback Wilderness models. It weighs about 0.116 lb against roughly 0.393 lb for the OEM pulley, cutting rotating mass at the front of the engine. Grooves are machined to match the factory belt path, and the anodized finish resists corrosion. It suits owners chasing quicker engine response and less parasitic drag; it does not add power, and the gain is small next to a tune or a lighter crank pulley.
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The PERRIN Alternator Pulley is a lightweight replacement for the factory alternator pulley on select Subaru Outback models. It is CNC-machined from 6061-T6 billet aluminum and has an anodized finish for corrosion resistance. The finish is blue (118BL).
The pulley weighs about 0.116 lb, compared with 0.393 lb for the OEM pulley. This reduces rotating mass and accessory-belt drag, which can slightly improve throttle response and efficiency. Precision-machined grooves match OEM and aftermarket belt paths for proper belt tracking.
