HKS 70020-AF101 Racing Suction Kit Legacy BE5 BH5 Forester SG5 SG9 Red 200mm

Vehicle Fitment

• Subaru Legacy B4 (BE5), EJ208 (D-spec twin-turbo)
• Subaru Legacy Wagon (BH5), EJ208 (D-spec twin-turbo)
• Subaru Forester XT (SG5), EJ205, 02/2002-11/2007
• Subaru Forester STI / XT (SG9), EJ255, 04/2002-07/2011

Fitment Notes

• This kit replaces the OEM air cleaner box entirely - unlike a drop-in filter or pipe-only kit, the Racing Suction removes and replaces the factory airbox assembly with an open-element filter and aluminum suction pipe system
• Compatibility is specific to the chassis codes listed above - the BE5/BH5 designation refers specifically to the EJ208 D-spec twin-turbo variant of the BE/BH generation Legacy, not all BE/BH Legacy models; verify your specific chassis code and engine code before ordering
• ECU or air flow meter recalibration may be required after installation - HKS notes that because there are many variants across the compatible chassis, some vehicles may require adjustment of the AFM output or fuel-related devices (such as an F-CON or equivalent fuel management device) to correctly account for the increased airflow following installation; this is a standard consideration for open-element Racing Suction installations
• Filter maintenance is required for sustained performance - HKS recommends regular replacement of the Super Power Flow filter element to maintain optimal airflow and filtration; the wet polyurethane filter is washable and can be reused after cleaning with appropriate filter cleaner and re-oiling
• Not CARB legal - this product does not have California Air Resources Board exemption and is not legal for use on emission-controlled vehicles in California or other states enforcing CARB standards

Features

• Hyper Stealth Frame replaces the OEM airbox with a compact open-element assembly engineered to maximize intake airflow within the available engine bay space - the redesigned stealth frame increases filter surface area by approximately 27% compared to the previous Racing Suction generation, and its 16 parabolic frame members are arranged to direct intake air smoothly into the filter element while maintaining structural rigidity in the high-vibration underhood environment
• Phi200mm x 80mm wet 2-layer polyurethane foam filter delivers high flow efficiency with effective particulate capture - the dual-density wet filter is impregnated with a special high-viscosity adhesive that captures fine particles while maintaining low restriction across the large filter surface area; the wet filter design provides greater filtration efficiency per unit of pressure drop compared to dry paper filter elements at equivalent flow rates
• Red filter with black anodized aluminum back plate and bold white HKS logo provides a visually prominent engine bay presence - the black anodized plate resists corrosion and heat discoloration in the underhood environment, and the white logo provides clear brand identification that is visible at a glance when the hood is raised
• Vehicle-specific aluminum suction pipe optimizes intake air routing for each application - the pipe angle and length are designed specifically for the BE5/BH5/SG5/SG9 engine bay layouts rather than being adapted from a universal design, ensuring the intake path from the filter to the turbo inlet is as direct and free-flowing as possible within each vehicle's packaging constraints
• Flexible frame support securely attaches the filter assembly to the aluminum back plate and guides filter seating for consistent sealing - the support system also simplifies filter removal and reinstallation during maintenance by providing a repeatable locating reference for the filter element on the back plate
• Washable and reusable filter element reduces long-term running costs versus disposable paper filter elements - the polyurethane foam filter can be cleaned, dried, and re-oiled for reinstallation without requiring replacement of the entire filter unit, provided the foam structure remains intact

Specifications

• Part Number: 70020-AF101
• HKS Product Name: RACING SUCTION BE5/BH5(D) EJ208 SG5/SG9 EJ2#5
• UPC: 4957266273845
• MSRP: $340.00
• Filter Size: Phi200mm x 80mm pipe OD
• Filter Color: Red
• Filter Type: Wet 2-layer polyurethane foam, washable, reusable
• Frame: Hyper Stealth Frame, 16 parabolic members, ~27% more surface area vs previous generation
• Back Plate: Black anodized aluminum
• Suction Pipe: Aluminum, vehicle-specific
• CARB Legal: No

Included Components

• 1x Hyper Stealth Frame filter assembly with black anodized aluminum back plate
• 1x Phi200mm wet 2-layer red polyurethane foam filter element
• 1x Vehicle-specific aluminum suction pipe
• Mounting hardware

Product Description

The HKS 70020-AF101 is the Racing Suction kit for the Subaru Legacy B4 (BE5) and Legacy Wagon (BH5) with the EJ208 D-spec twin-turbo engine, and for the Subaru Forester XT (SG5/EJ205, 02/2002-11/2007) and Forester STI/XT (SG9/EJ255, 04/2002-07/2011). It replaces the OEM air cleaner box entirely with HKS's Hyper Stealth Frame open-element filter system, which pairs a Phi200mm wet dual-density polyurethane foam filter with a vehicle-specific aluminum suction pipe to reduce intake restriction and improve turbo response.

The Hyper Stealth Frame is HKS's current-generation filter cage, redesigned to increase filter surface area by approximately 27% over the previous Racing Suction frame and constructed with 16 parabolic frame members for structural efficiency and smooth airflow entry into the filter. The black anodized aluminum back plate carries the white HKS logo and supports both the frame and filter assembly. The wet 2-layer polyurethane filter element is impregnated with high-viscosity adhesive for effective particle capture at high airflow rates, and is washable and reusable. The aluminum suction pipe is designed specifically for the BE5/BH5/SG5/SG9 engine bay geometry to optimize the intake air path between the filter and the turbo compressor inlet.

HKS advises that some vehicles within the compatible chassis range may require AFM recalibration or fuel management adjustment after installation to correctly account for the increased intake airflow. This is a standard installation consideration for open-element intake systems on turbocharged EJ-series Subaru engines and should be planned for accordingly. Not CARB legal.