Product Details
About this part
Upgrade Your B58 Catch Can System with a True Dual-Vent Solution
Take your B58 BMW or Supra’s crankcase ventilation performance to the next level with the BMS Oil Filler Cap Dual Vent Connection Kit = the missing link for ultimate catch can and engine efficiency.
This precision-machined billet cap replaces the factory oil filler cap and creates a second dedicated exit point for dirty PCV gases. That means both the crankcase vent and the valve cover breather can now be routed into your oil catch can. Twice the inputs into your catch can means twice the oil vapor capture, keeping harmful oil mist out of your intake tract. Cleaner air, cleaner intake valves, and a more efficient PCV system, more efficient engine, it’s a simple upgrade with major payoffs.
Why This Matters:
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Double the Captured Flow: Adds a second breather port for PCV/vapor extraction so you pull more blow-by gasses into your catch can.
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Reduces Piston Resistance: This creates a slight negative pressure (vacuum) in the crankcase, reducing the resistance the pistons face as they move, improving fuel economy and performance.
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Manages Pressure: "Blow-by" gases (unburned fuel, air, combustion byproducts) get past piston rings into the crankcase, creating pressure.
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Cleaner Combustion Air: Reduces oil vapor recirculation that leads to intake valve carbon buildup.
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Maximized Catch Can Efficiency: Works with the BMS catch can to let it do more of its job.
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Perfect For: Anyone running a B58 BMS oil catch can looking to squeeze every bit of performance and protection from their PCV system, especially on tuned or high-boost builds.
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Precision-Built Fit: CNC billet aluminum construction replaces the factory filler cap for a secure, purposeful connection.
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All Hardware Included: Includes billet cap, AN fittings, high-temp hose, T-fitting, and clamps for a clean install.
Fitment:
B58-powered BMW and Supra
BMS Oil Catch Can for G Chassis Gen 2 B58 BMW M240 M340 M440
BMS Oil Catch Can for 2020+ B58 Toyota Supra GR MK5
B58 Vehicle Fitment
BMW 2 Series
• 2022+ G42 B58 BMW M240i, M240i xDrive, and M240xi
BMW 3 Series
• 2019+ G20 G21 B58 BMW M340i, M340i xDrive, and M340xi
BMW 4 Series
• 2021+ G22 G23 G26 B58 BMW M440i, M440i xDrive, and M440xi including Gran Coupe
Toyota
• 2020-2026 Toyota GR Supra Mk5 B58 3.0L 6 cyl.
What's Included:
(1) BMS B58 BMW Billet Oil Filler Breather Cap
(1)-12ORB 90º to -12AN fitting
(1)-12 AN barbed straight Fitting
(1) Heavy-duty custom silicone hose
(1) Barbed PCV T- fitting
(3) Hose clamps
Fitment
Not sure it fits? Contact us with your car's year, model and VIN and we'll help you confirm before you order.
If a part doesn't fit as expected, contact us and we'll work with you to resolve it.
Majority of products have a fitment section in the product description or within the title.
Returns
- Unused, uninstalled parts can be returned or exchanged within 30 days of the order date.
- To start a return: Contact us first, don't use Return to Sender.
- Returns can have up to a 20% restocking fee.
- Built-to-order and special-order items can't be returned or cancelled once production begins.
Shipping
- Orders are processed 7 days a week to ensure your product ships as quickly as possible.
- Inspect parts within 10 days of delivery, and reach out regarding any damage or missing pieces.
See our Tariff Policy
Warranty
- All parts retain the manufacturer's warranty.
- Warranty claims are subject to the manufacturer's approval.