Air Box Covers

Air Box Covers: sealed intake housings for cleaner, cooler airflow

Air box covers and the airboxes they close up do a simple but important job. The cover seals the housing around your air filter so the engine draws from a controlled space instead of pulling hot underhood air over the filter. A sealed box keeps debris and heat out, holds the filter in place, and on many builds routes cooler air to the inlet. On dirt bikes and quads, the airbox and its cover are also your first line of defense against dust and water past the filter. Fit one when you want tidier packaging, a proper seal after an intake swap, or a replacement for a cracked factory unit.

What ThreePiece stocks

This category currently lists 44 products spanning 13 brands: aFe, Cycra, K&N Engineering, COBB, Vance and Hines, Kuryakyn, Mishimoto, Spectre, SLP, Uni Filter, BMC, Weapon R and HKS. Prices run from $27 to $1,204 at the time of writing - that is the live range on what is in stock, not a fixed promise. The spread covers everything from simple covers up to full carbon airbox assemblies like the HKS Toyota Supra GR dry carbon air intake box and the K&N carbon fiber 4in racing air box with air horn.

How to choose

Start with the vehicle type. For turbo cars, sealed and semi-open boxes like the COBB Subaru STI airbox and the Mishimoto BMW G8X M3/M4 open airbox intake are built to bolt into a specific chassis, so fitment is the deciding factor, not price. If you want a universal build, the BMC universal carbon dynamic airbox kit with an 85mm inlet/outlet lets you size around your own inlet plumbing, as does the K&N carbon 4in air box assembly with base and hardware. Carbon assemblies sit at the top of the price range; a plain cover or a powersports box is where the low end lives. Match the design to your goal - a sealed box for a street car, a robust dust-sealing cover for a dirt bike.

What else you need

An airbox is only as good as the filter inside it. Pair it with a replacement air filter, a drop-in filter, a panel filter, or an air filter element sized for your housing. If you are still deciding on the whole intake path, browse cold air intake kits and the broader Air Intakes section for related hardware.

Fitment and ordering

Of the products here, 24 list fitment data covering makes including Subaru, BMW, Chevrolet, Ford, Nissan, Toyota and KTM, on vehicles such as the Subaru WRX, Ford F-150, Chevrolet Camaro and BMW M3/M4, across model years 1998 to 2024. Always confirm the box or cover matches your exact year and inlet before ordering. Need a hand? Call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available.

Air Box Covers: sealed intake housings for cleaner, cooler airflow

Air box covers and the airboxes they close up do a simple but important job. The cover seals the housing around your air filter so the engine draws from a controlled space instead of pulling hot underhood air over the filter. A sealed box keeps debris and heat out, holds the filter in place, and on many builds routes cooler air to the inlet. On dirt bikes and quads, the airbox and its cover are also your first line of defense against dust and water past the filter. Fit one when you want tidier packaging, a proper seal after an intake swap, or a replacement for a cracked factory unit.

What ThreePiece stocks

This category currently lists 44 products spanning 13 brands: aFe, Cycra, K&N Engineering, COBB, Vance and Hines, Kuryakyn, Mishimoto, Spectre, SLP, Uni Filter, BMC, Weapon R and HKS. Prices run from $27 to $1,204 at the time of writing - that is the live range on what is in stock, not a fixed promise. The spread covers everything from simple covers up to full carbon airbox assemblies like the HKS Toyota Supra GR dry carbon air intake box and the K&N carbon fiber 4in racing air box with air horn.

How to choose

Start with the vehicle type. For turbo cars, sealed and semi-open boxes like the COBB Subaru STI airbox and the Mishimoto BMW G8X M3/M4 open airbox intake are built to bolt into a specific chassis, so fitment is the deciding factor, not price. If you want a universal build, the BMC universal carbon dynamic airbox kit with an 85mm inlet/outlet lets you size around your own inlet plumbing, as does the K&N carbon 4in air box assembly with base and hardware. Carbon assemblies sit at the top of the price range; a plain cover or a powersports box is where the low end lives. Match the design to your goal - a sealed box for a street car, a robust dust-sealing cover for a dirt bike.

What else you need

An airbox is only as good as the filter inside it. Pair it with a replacement air filter, a drop-in filter, a panel filter, or an air filter element sized for your housing. If you are still deciding on the whole intake path, browse cold air intake kits and the broader Air Intakes section for related hardware.

Fitment and ordering

Of the products here, 24 list fitment data covering makes including Subaru, BMW, Chevrolet, Ford, Nissan, Toyota and KTM, on vehicles such as the Subaru WRX, Ford F-150, Chevrolet Camaro and BMW M3/M4, across model years 1998 to 2024. Always confirm the box or cover matches your exact year and inlet before ordering. Need a hand? Call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available.