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After polishing
Adjusting the spring preload and air volume requires minor tuning to match your specific boost levels and driving style
nitrided Napier steel rings
This rotor’s unique drilled and slotted design efficiently vents gases trapped between the pad and rotor
Perrin Water Pump Pulley Red 2022-2026 WRX / 2019-2025 Ascent / 2019-2025 Forester / 2020-2025 Legacy / 2021-2025 Crosstrek / 2020-2025 Outback / 2024-2025 Impreza YMM_2009_Outback After polishingPerrin Water Pump Pulley Red 2022 2026 WRX 2019 2025 Ascent 2019 2025 Forester 2020 2025 Legacy 2021 2025 Crosstrek 2020 2025 Outback 2024 2025 Impreza Lightweight 6061 T6 Aluminum Performance Engine Pulley Overview The Perrin Water Pump Pulley is a precision engineered upgrade designed for Subaru enthusiasts looking to improve engine efficiency and response. By replacing the heavier OEM pulley with a lightweight billet aluminum alternative, this
