Lightweight aircraft grade aluminium Lightened underdrive pulley kit For MY08-on WRX/Sti

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GFB Performance Underdrive Pulley reduces parasitic load on the engine by decreasing the rotational mass and drive ratio of accessory pulleys. This lightweight CNC-machined alumini um pulley frees up additional power by reducing the energy required to drive alternators, power steering pumps, and air conditioning compressors. Suitable for performance street and track builds seeking incremental power gains. Compatible with specific vehicle applications as listed — direct replacement for OEM pulley with no machining or modification required. Show more