Breather Components

Breather Components: Vent the Crankcase, Keep Oil Where It Belongs

Breather components manage the pressure and oil mist that build up inside a running engine's crankcase. Every combustion cycle pushes a little blow-by past the rings, and that pressure has to go somewhere. A breather, catch can, or head breather kit gives it a controlled exit - filtering or separating oil from the vapor so it doesn't foul your intake, cake your valve covers, or weep out of gaskets. On a Harley top end you're venting the heads cleanly; on a turbo Subaru you're routing crankcase vapor away from the intake tract and catching oil before it reaches the charge air. Fit one to stop misting, keep the intake side clean, and tidy up the vent plumbing.

What We Stock

There are 32 breather components in this category, currently priced from $28 to $544 - that's the live range on what's in stock, not a standing offer. Across those 32 parts we carry 12 brands. The deepest are Kuryakyn and S&S Cycle with eight products each, followed by Moroso with five and Perrin Performance with three. You'll also find Torque Solution, Radium Engineering, BD Diesel, Wehrli, Ford Racing, Cometic Gasket, Spectre and Bikers Choice.

The coverage leans three ways. For V-twins, the S&S Cycle M8 Billet Head Breather Kit and the S&S Cycle 99-17 Twin Cam Billet Head Breather Kit cover the head-vent job directly. For turbo Subarus there's the Torque Solution AN Breather Fittings for EJ25 engines. For a universal catch-can approach, the Moroso aluminum Catch Can with two -10AN fittings and the black powder-coat 10AN version handle separation. At the top of the range sits the BD Diesel Crank Case Vent Filter Kit for the 1999-2003 Ford 7.3L.

How to Choose

Match the part to the job. A vehicle-specific head breather or fitting kit bolts to a known engine and needs no fabrication - that's the S&S kits for Harley Twin Cam and M8, the Torque Solution fittings for the Subaru EJ25, and the BD Diesel kit for the Ford 7.3L. A universal catch can like the Moroso tanks separates and traps oil but leaves the routing and fitting selection to you, which is why they run on AN fittings. Decide first whether you want a drop-in kit for your engine or a tank you'll plumb yourself. Of the 32 parts, 13 list specific fitment; the top makes are Subaru, Harley-Davidson and Ford, spanning model years from 1977 to 2025, with vehicles including the Subaru WRX, Harley Big Twin, Twin Cam, Evolution, Sportster and M8, and the Ford F-Series.

What Else You Need

Catch-can setups almost always need plumbing. Browse Fittings and Adapters to complete the AN routing, and check Gasket Kits or Head Gaskets if you're pulling covers to install a head breather. The full Engine Components section holds related parts like Oil Filters.

Fitment and Ordering

Not sure which breather fits your engine? Call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available at checkout.

Breather Components: Vent the Crankcase, Keep Oil Where It Belongs

Breather components manage the pressure and oil mist that build up inside a running engine's crankcase. Every combustion cycle pushes a little blow-by past the rings, and that pressure has to go somewhere. A breather, catch can, or head breather kit gives it a controlled exit - filtering or separating oil from the vapor so it doesn't foul your intake, cake your valve covers, or weep out of gaskets. On a Harley top end you're venting the heads cleanly; on a turbo Subaru you're routing crankcase vapor away from the intake tract and catching oil before it reaches the charge air. Fit one to stop misting, keep the intake side clean, and tidy up the vent plumbing.

What We Stock

There are 32 breather components in this category, currently priced from $28 to $544 - that's the live range on what's in stock, not a standing offer. Across those 32 parts we carry 12 brands. The deepest are Kuryakyn and S&S Cycle with eight products each, followed by Moroso with five and Perrin Performance with three. You'll also find Torque Solution, Radium Engineering, BD Diesel, Wehrli, Ford Racing, Cometic Gasket, Spectre and Bikers Choice.

The coverage leans three ways. For V-twins, the S&S Cycle M8 Billet Head Breather Kit and the S&S Cycle 99-17 Twin Cam Billet Head Breather Kit cover the head-vent job directly. For turbo Subarus there's the Torque Solution AN Breather Fittings for EJ25 engines. For a universal catch-can approach, the Moroso aluminum Catch Can with two -10AN fittings and the black powder-coat 10AN version handle separation. At the top of the range sits the BD Diesel Crank Case Vent Filter Kit for the 1999-2003 Ford 7.3L.

How to Choose

Match the part to the job. A vehicle-specific head breather or fitting kit bolts to a known engine and needs no fabrication - that's the S&S kits for Harley Twin Cam and M8, the Torque Solution fittings for the Subaru EJ25, and the BD Diesel kit for the Ford 7.3L. A universal catch can like the Moroso tanks separates and traps oil but leaves the routing and fitting selection to you, which is why they run on AN fittings. Decide first whether you want a drop-in kit for your engine or a tank you'll plumb yourself. Of the 32 parts, 13 list specific fitment; the top makes are Subaru, Harley-Davidson and Ford, spanning model years from 1977 to 2025, with vehicles including the Subaru WRX, Harley Big Twin, Twin Cam, Evolution, Sportster and M8, and the Ford F-Series.

What Else You Need

Catch-can setups almost always need plumbing. Browse Fittings and Adapters to complete the AN routing, and check Gasket Kits or Head Gaskets if you're pulling covers to install a head breather. The full Engine Components section holds related parts like Oil Filters.

Fitment and Ordering

Not sure which breather fits your engine? Call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available at checkout.