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 pressure balance around the turbo seals, the Perrin Turbo Sump Restrictor helps maintain engine cleanliness and reduces the risk of oil contamination in the exhaust. This is particularly valuable for Subaru enthusiasts who demand reliability and longevity from their turbocharged engines while preserving the factory oil delivery system. Installation requires no tuning, making it a practical upgrade for daily drivers and performance builds alike.
Features & Specifications
This Perrin Turbo Sump Restrictor is engineered for Subaru WRX, Ascent, Legacy XT, Outback XT, and Forester XT models and features a size 6 clamp and 1/4 - 28 plug for secure installation. Constructed from durable materials, it enhances turbo sump pump efficiency to reduce oil seal leaks without affecting oil flow, ideal for Subaru owners seeking to eliminate burning oil smells and blue smoke.
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Brand: Perrin Performance
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Product: Turbo Sump Restrictor
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Part Number: PSP-ENG-630
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Fitment: 2018-2024 WRX, 2019-2025 Ascent, 2020-2025 Legacy XT, 2020-2025 Outback XT, 2017-2018 Forester XT
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Material: High-grade aluminum and steel clamp
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Finish: Natural metal finish
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Construction: Precision machined
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Origin: USA
Key Benefits
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Performance: Eliminates burning oil smell and blue exhaust smoke caused by turbo seal leaks
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Reliability: Maintains proper turbo sump vacuum without altering oil flow or causing wear
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Fitment: Designed specifically for multiple Subaru turbocharged platforms ensuring precise compatibility
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Ease of Use: No tuning required after installation, making it a straightforward upgrade
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Durability: Constructed from quality materials to withstand engine bay conditions
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Value: Addresses a common issue that can worsen with exhaust modifications, protecting your investment
What's Included
- 1× Perrin Turbo Sump Restrictor
- 1× Size 6 Clamp
- 1× 1/4 - 28 Plug
- Installation instructions
Installation & Compatibility
Installation of the Perrin Turbo Sump Restrictor is a moderate DIY task that requires basic hand tools and familiarity with the turbo system. The restrictor clamps onto the turbo sump pump line and includes a plug for proper sealing. No tuning or ECU adjustments are necessary post-installation, making it accessible for enthusiasts comfortable with simple engine bay work. This part is compatible with the specified Subaru models but does not fit the 2025 WRX; owners of that model should refer to the updated part PSP-ENG-628.
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Professional Installation: Recommended for those unfamiliar with turbo plumbing
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Modifications Required: None
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Verify Compatibility: Confirm fitment for your specific year and trim level before purchase
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