Cobb Subaru Airbox - 2015-2018 Subaru STI

The COBB SF Airbox adds the benefits of a cold air intake to the proven performance of the COBB SF Intake. By using the factory inlet/snorkel to direct cool air from the front grille into an enclosed airbox, this setup helps keep hot engine bay air out of the intake path for more consistent performance.

Unlike many in-fender cold air intakes, the COBB SF Airbox is also designed to help separate rainwater from the intake air, reducing the water ingestion concerns that can come with other intake layouts. The result is a cleaner, more OEM-like solution that supports performance without sacrificing practicality.

Key Features

• Cold Air Intake Benefits: Helps feed cooler air to the intake system for more consistent performance.
• Uses Factory Snorkel: Takes advantage of the OEM inlet path to direct fresh air into the airbox.
• Helps Block Engine Bay Heat: Enclosed design reduces exposure to hot under-hood air.
• Water Management Advantage: Designed to separate rainwater from intake air, unlike many in-fender CAI setups.
• 16 Gauge Aluminum Construction: Durable aluminum build for strength and long-term use.
• OEM-Quality Fit and Finish: One-piece surround and directional lid for a clean, integrated install.
• Easy Installation: Includes the necessary components for a straightforward installation.

Cobb University - Intake System

Why We Like It

This is a smart solution for STI owners who want the performance benefits of a colder air source without the compromises that often come with traditional cold air intakes. It keeps the setup clean, protects against hot engine bay air, and avoids the water ingestion issues that can make other intake systems a hassle.

Confirmed Fitment

• 2015–2018 Subaru STI

Specifications

• Material: 16 gauge aluminum
• Design: One-piece surround with directional lid
• Hardware: Stainless steel hardware included
• Air Source: Factory snorkel / front grille inlet

Installation Notes

Cobb Tuning Official Install Instructions

• Designed to work with the COBB SF Intake.
• Uses the factory snorkel to feed cold air into the airbox.
• Includes the components needed for installation.
• Follow COBB install instructions for best fitment and sealing.

What’s in the Box

• COBB SF Airbox
• Directional lid
• Stainless steel hardware
• Required installation components (per COBB kit contents)

Compatibility & Disclaimers

Designed for 2015–2018 Subaru STI applications and intended for use with the COBB SF Intake. Always confirm compatibility with your current intake setup before ordering.