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The PERRIN Alternator Pulley is a lightweight aftermarket replacement for the stock alternator pulley on Subaru's 2.4-liter turbocharged FA24 engines, including the 2022 and newer WRX and the Outback XT, Legacy XT and Forester XT. It cuts rotational mass at the front of the engine and adds a machined finish under the hood. It is a small, mostly cosmetic and response-oriented upgrade, not a power adder, and it does nothing for cars with the naturally aspirated 2.5. Rivals in this space are few, so the main comparison is against the stock pulley, which is heavier and plainer.
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The PERRIN Alternator Pulley is made to reduce rotational mass on the alternator. It also gives the engine bay a dressed-up look.
It fits 2022-2026 WRX, Outback XT, Legacy XT and Forester XT models.
