Click to zoom in
SKU: 70020-AF108 | UPC: 4957266275559
HKS RS VAB VAF Air Intake System Subaru WRX STI EJ257 2008-2021
The HKS RS VAB VAF delivers a complete cold air intake upgrade for Subaru WRX STI models equipped with the EJ257 engine from 2008 to 2021. This system replaces the restrictive factory airbox with a high-flow dry filter and aerodynamic ducting to pull in cooler, denser air for noticeable gains in horsepower and acceleration. Drivers experience sharper throttle response and aggressive intake growl during hard shifts.
Key Features
- Dry Multi-Layer Filter: Progressive density design traps 99% of 5 micron particles while flowing 40% more air than stock for unrestricted engine breathing.
- FRP Resin Airbox: Lightweight fiber-reinforced plastic construction resists deformation under boost and heat for long-term durability.
- Integrated Heat Shield: Aluminum shield blocks engine bay heat to lower intake temperatures by up to 20 degrees F for denser air charge.
- Optimized Filter Angle: Slanted mounting position accelerates airflow velocity into the turbo inlet for improved spool and mid-range torque.
- Factory Bolt-On Design: Matches OEM mounting points with included adapters for seamless integration on STI EJ257 setups.
Product Notes
- Direct OEM replacement, no ECU modifications needed for daily driving.
- Clean filter every 10,000 miles or sooner in dusty conditions for peak performance.
- Packaged in sturdy HKS box to prevent damage during transit.
Installation Notes
- Professional installation recommended.
- Remove stock airbox and MAF sensor housing in 30-45 minutes.
- All clips, brackets, and silicone couplers provided for direct fit.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2014 | Subaru | Impreza WRX STI | All (EJ257) |
| 2015-2021 | Subaru | WRX STI | All (EJ257) |
Why Choose HKS?
- Motorsport-proven designs from Super GT and rally programs.
- JDM manufacturing standards ensure exact tolerances and reliability.
- Dyno-tested power gains of 5-10 whp on stock STI EJ257 tunes.
Frequently Asked Questions
-
Q: Will this fit my 2008 STI?
A: Yes, compatible with all 2008.5-2021 USDM WRX STI models powered by EJ257 engine, sedan body styles. -
Q: What is the filter material and cleaning method?
A: Synthetic dry media, no oil required. Wash with mild soap, air dry, and reinstall for reuse up to 50,000 miles. -
Q: Does installation require custom tuning?
A: No tuning needed for stock or lightly modified EJ257 engines, bolt-on and drive.
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Original HKS box measures 15.75 x 11.42 x 8.66 inches
- Weight: 4.41 lbs
Air Intake Systems
Air intake systems for Hellcat, Trackhawk, TRX, HEMI, and import performance platforms are stocked at Black Ops Auto Works. Shop cold air intakes, short ram intakes, air boxes, intake elbows, mass air flow sensors, scoops, snorkels, and silicone couplers for street cars, trucks, Jeeps, and supercharged Mopar builds. Every intake system is filterable by vehicle platform, engine, and intake style so the correct part ships the first time. Black Ops Auto Works carries 4,427 air intake SKUs across cold air intakes, short ram intakes, and supporting components. What This Category Covers An air intake system pulls outside air into the engine and filters it before combustion. Upgrading the factory intake with a cold air intake, short ram intake, or carbon fiber system can improve airflow, throttle response, induction sound, and horsepower potential on compatible applications. Cold Air Intakes vs Short Ram Intakes Cold air intakes route the filter away from engine bay heat for cooler, de...
View Air Intake Systems Products
Cold Air Intakes
Shop cold air intakes, short ram intakes, closed-airbox intake systems, replacement air filters, intake tubes, and MAF housings from K&N, AEM, aFe Power, Airaid, S&B Filters, Injen, Roush, Volant, Corsa, Mishimoto, HPS Performance, Cobb Tuning, JLT, Vararam, Steeda, and other performance intake brands. Find full open-element cold air intakes, sealed-airbox systems, dry and oiled air filters, replacement drop-in filter panels, MAF sensor housings, and complete intake tube kits. Cold air intakes for domestic muscle, sport-compact tuners, diesel trucks, off-road 4x4, Euro performance, and modern sport SUVs Mustang, Camaro, Challenger, Charger, F-150, Silverado, Ram, Tundra, Tacoma, 4Runner, Wrangler, Bronco, Cummins, Duramax, Power Stroke, WRX/STi, Civic Type R, GR86, Supra, GR Corolla, BMW M2/M3/M4, Golf R, and hundreds of additional platforms. Filter by vehicle, intake style (open element, closed airbox, short ram, tube kit), filter media (oiled cotton, dry synthetic), tun...
View Cold Air Intakes Products
HKS
HKS Japanese performance parts for Toyota Supra, Nissan Skyline GT-R, Nissan Silvia and 240SX, Subaru WRX and STI, and other JDM platforms are stocked at Black Ops Auto Works. Shop turbo kits, cat back exhaust systems, coilovers, blow off valves, and engine management upgrades for RB26DETT, SR20DET, 2JZ-GTE, and EJ series turbocharged engines. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 607 HKS SKUs across forced induction, exhaust, suspension, and engine management categories. What This Collection Covers HKS has built its reputation on Japanese sport compact and sports car performance since the late 1970s, developing turbo kits, exhaust systems, and suspension for platforms including the Toyota Supra 2JZ-GTE, Nissan Skyline GT-R RB26DETT, Nissan Silvia and 240SX SR20DET, and Subaru WRX and STI EJ and FA series engines. This collection brings together fitment verified HKS pa...
View HKS Products