STILLEN 2015-2021 Subaru WRX Hi-Flow Air Intake Kit [VA1] - 402000

The STILLEN Hi-Flow Air Intake Kit [VA1] for 2015-2021 Subaru WRX is a bolt-on performance upgrade that significantly improves airflow, throttle response, and engine power. Featuring mandrel-bent aluminum tubes, an aluminum heat shield, and a high-quality STILLEN oiled air filter, this intake draws the coolest possible air charge while preventing hot engine bay air from reducing performance. Compatible with the factory air duct and ECU, this intake delivers a 30 WHP and 32 WTQ gain* with no check engine light or tuning required.

Fitment:

• 2015-2021 Subaru WRX (VA1 chassis)

Key Features:

• Not for sale in California
• 30 WHP & 32 WTQ gain*
• Improved throttle response across the entire rev range
• Mandrel-bent aluminum intake tubes with durable black powder coat finish
• Aluminum heat shield and STILLEN polyurethane cover included
• Compatible with factory air duct
• Plug-and-play MAF wiring harness
• No check engine light (CEL) issues
• High-quality STILLEN washable oiled air filter
• Improves MPG by reducing airflow restriction
• Limited lifetime warranty
• Simple bolt-on installation
• No ECU tuning required

*Results may vary

Technical Details / Performance:

• Material: Mandrel-bent black powder-coated aluminum intake tubes
• Heat shield: Aluminum, fully protects intake from hot engine bay air
• Intake filter: STILLEN washable oiled air filter, serviceable
• Maintains safe Air-Fuel Ratio and ECU compatibility
• Reduces power drop at mid-range RPM by smoothing airflow
• Enhances throttle response, torque delivery, and engine sound
• Compatible with OEM MAF sensor wiring
• STI part number: 402000