SKU: B716100 | UPC: 700424677665
Cobb 2019-2021 Subaru STI / STI Type RA Airbox
The COBB SF Airbox delivers substantial increases in intake airflow for 2019-2021 Subaru Impreza WRX STI and STI Type RA models. This direct-replacement airbox features smooth internal geometry and a large velocity stack to feed your EJ25 engine more air efficiently. Dyno testing shows gains up to 10+ whp and torque across the powerband when paired with COBB SF Intake.
Key Features
- Large 5.5″ Inlet: Allows massive air volume intake while maintaining laminar flow into the MAF sensor.
- Velocity Stack Design: Smooth bellmouth entry reduces turbulence and improves volumetric efficiency.
- Integrated Mounting Points: Secures OEM MAF housing, filter, and crankcase breather tube without modifications.
- Heat-Resistant Construction: High-temp polymer isolates engine bay heat for cooler, denser intake charge.
- Perfect OEM Fitment: Bolts directly in place of stock airbox, no trimming or adapters required.
Product Notes
- Requires COBB SF Air Filter (sold separately) for full performance.
- Clean filter regularly in dusty conditions to maintain airflow.
Installation Notes
- Professional installation recommended.
- 30-45 minute install using basic hand tools remove stock airbox via 4 bolts.
- Compatible with stock intake pipe, COBB SF Intake, and Accessport tuning.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2019-2021 | Subaru | Impreza WRX STI | – |
| 2019-2021 | Subaru | Impreza WRX STI | Type RA |
Why Choose COBB?
- Subaru specialists with decades of EJ engine development experience.
- Every part dyno-tested for real-world power gains.
- Precision-engineered in the USA for exact fit and reliability.
Frequently Asked Questions
- Q: Does this fit 2019-2021 STI hatchback or sedan?
A: Fits all 2019-2021 STI sedans including Type RA VA chassis confirmed. - Q: What material is the airbox made from?
A: Durable, heat-resistant nylon-reinforced polymer for strength and longevity. - Q: Is tuning or ECM flash required?
A: No, plug-and-play with stock tune pairs with COBB Accessport for full gains.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure box measures 20″ x 14″ x 12″
- Weight: 4.1 lbs
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