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Perrin Turbo Sump Restrictor 2018-2022 WRX / 2019-2023 Ascent / 2020-2022 Legacy XT / 2020-2023 Outback XT

Save $7.50 Save $7.50
Original price $50.00
Original price $50.00 - Original price $50.00
Original price $50.00
Current price $42.50
$42.50 - $42.50
Current price $42.50

Here, you are looking at the Perrin Turbo Sump Restrictor for your late model FA20-powered WRX or FA24DIT-powered Subaru!

Fix both the burning oil smell and blue exhaust smoke problems by installing the PERRIN Turbo Sump Restrictor!

Key Features:

  • Eliminate burning oil and blue smoke
  • No tuning is required after installation
  • Makes the turbo sump more effective
  • Creates a balance of exhaust pressure and vacuum on turbo seals
  • Reduces the amount of leaking around turbo seals
  • Does not change oil flow to turbo

Why You Want This

Many people experience a burning oil problem and blue smoke coming from their exhaust. This problem can worsen after installing a cat-back exhaust, J-pipe, or turbo-back exhaust system. The installation of these parts can cause a change in exhaust pressure that allows engine oil to escape out of the turbo seals, causing the burning oil smell and blue smoke. The PERRIN Turbo Sump Restrictor quickly eliminates this issue!

How the PERRIN Part Works

The PERRIN Turbo Sump Restrictor makes the turbo sump pump more effective at sucking oil out of the turbo sump. This in turn creates a slight vacuum on the turbo sump creating a proper balance of exhaust pressure and vacuum on the turbo seals, significantly reducing the amount of leaking around the turbo seals. This does not change the oil flow to the turbo or create any wear.

Plug & Play

Our plug-and-play Sump Pump Restrictor is designed for ease of installation on most 2018 and newer Subarus. With no need for cutting hoses, installation is quick and effortless.

No Tuning Required

Customer Reviews

Based on 1 review
zachary cabuzzi
Must have if you install high flow cat / catless downpipe

I had a ton of white smoke coming out of the back of my car and thought I blew a headgasket. After installing the restrictor there is hardly anymore smoke. Also literally a 10 minute install. Maybe more if you do a better job than I did. Also I cant find many threads on this, If you have an AOS like me there is a 3rd nipple on the restrictor. You do not need an additional line unless you have the PERRIN AOS.


Thank you for your 5 Star Review of the Perrin Turbo Sump Restrictor. I am glad to hear that the sump restrictor has helped reduce the white smoke coming from your car. As you said it is a must-have if you install a high flow cat or catless downpipe. It is great to hear that the installation was quick and easy for you as well. Thank you for providing additional information about the 3rd nipple on the restrictor, as it may be helpful for other customers who have the Perrin AOS!