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 Connection Kit = the missing link for ultimate catch can 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, it’s a simple upgrade with major payoffs.

Why This Matters:

Double the Captured Flow – Adds a second breather port for PCV/vapor extraction so you pull more blow-by gasses into your catch can.
Cleaner Combustion Air – Reduces oil vapor recirculation that leads to intake valve carbon buildup.
Maximized Catch Can Efficiency – Works with any BMS catch can to let it do more of its job.
Precision-Built Fit – CNC billet aluminum construction replaces the factory filler cap for a secure, purposeful connection.
All Hardware Included – Includes billet cap, AN fittings, high-temp hose, T-fitting, and clamps for a clean install.

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.

Fitment:
B58-powered BMWs and Toyotas (M240i, M340i, M440i, 2020+ 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+ 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