Perrin Turbo Sump Restrictor 2018-2024 WRX / 2019-2025 Ascent / 2020-2025 Legacy XT / 2020-2025 Outback XT / 2017-2018 Forester XT | Reduces Turbo Seal Leaks | Turbo Oil Control Overview The Perrin Turbo Sump Restrictor is a precision-engineered solution designed to address common turbo oil seal issues found in select Subaru models, including the 2018-2024 WRX, 2019-2025 Ascent, 2020-2025 Legacy XT, 2020-2025 Outback XT, and 2017-2018 Forester XT. This component improves the effectiveness of the turbo sump pump by creating a slight vacuum in the turbo sump, which balances exhaust pressure and vacuum on the turbo seals. The result is a significant reduction in oil leakage that often manifests as burning oil smells and blue exhaust smoke. Developed by Perrin Performance, a brand known for its commitment to quality and Subaru-specific engineering, this restrictor is designed to integrate seamlessly with the factory turbo system without altering oil flow or causing additional wear. Its design philosophy focuses on solving a real-world problem that affects Subaru owners, especially those who have upgraded their exhaust systems and noticed worsening oil seal leaks. By restoring proper