SKU: B724100-BK | UPC: 799928865333
Cobb Subaru SF Intake System – Stealth Black for 2008-2021 WRX STI
The Cobb SF Intake System in Stealth Black replaces the factory airbox on 2008-2021 Subaru WRX STI models with a high-flow design that pulls in cooler, denser air for added horsepower and torque. This bolt-on system improves throttle response and engine sound while maintaining heat protection from the stock air dam. Dyno-tested gains reach up to 20 whp and 18 ft-lbs torque with proper tuning.
Key Features
- Large 4-inch conical filter: Oversized design with velocity stack captures 50% more airflow than stock for unrestricted intake.
- 3.5-4 inch tapered aluminum MAF housing: Smooth mandrel-bent tube eliminates restrictions, accurately meters air for ECU.
- High-quality silicone couplers and T-bolt clamps: Secure, vibration-resistant connections prevent boost leaks.
- Integrated air dam bracket: Retains factory cowl for water and debris protection during track or street use.
- Stealth black powdercoat finish: Corrosion-resistant coating blends underhood for clean, OEM+ appearance.
Product Notes
- EPA compliant for all 50 states no CEL when installed alone.
- Clean filter every 15,000 miles or sooner in dusty conditions for peak performance.
- Monitor air/fuel ratios, Accessport tuning unlocks full gains.
Installation Notes
- Professional installation recommended.
- Bolt-on design installs in under 1 hour with basic hand tools;no trimming or modifications needed.
- Reuses factory MAF sensor and mounting hardware for plug-and-play fit.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2014 | Subaru | Impreza | WRX STI |
| 2015-2021 | Subaru | WRX | STI |
Why Choose Cobb?
- 20+ years engineering Subaru performance parts with real-world dyno data.
- Every component tested for durability on street and track.
- Precision CNC-machined and welded construction for exact fitment.
Frequently Asked Questions
- Q: Will this fit my 2015-2021 WRX STI?
A: Yes, direct fit for all 2015-2021 Subaru WRX STI models including sedan and hatchback variants. - Q: What materials are used in the Stealth Black finish?
A: 6061-T6 aluminum tube with durable powdercoat finish resists heat and corrosion, filter is oiled cotton gauze. - Q: What is the warranty and tuning requirement?
A: Cobb limited lifetime warranty on atmosphere components, no tune required but Cobb Accessport maps recommended for optimal power.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Ships in single box measuring 23″ x 14″ x 11″
- Weight: 6.8 lbs
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