COBB 715315-BL Blue SF Intake + Airbox System for 2015–2018 Subaru WRX STI

The COBB SF Intake and Airbox System for the 2015–2018 Subaru WRX STI delivers the perfect balance of performance, reliability, and OEM-like fitment. This uniquely engineered air intake combines the advantages of both a short ram intake and a cold air intake—without any of the typical drawbacks.

At the core of the system is a custom conical filter paired with a CFD-designed velocity stack and a proprietary airflow straightener grid. These components work together to smooth incoming airflow and ensure accurate MAF sensor readings, eliminating turbulence-related dead spots that commonly affect other aftermarket intakes.

The intake body is constructed from a high-temperature plastic composite—lighter than metal and far more effective at rejecting under-hood heat. This ensures cooler intake air temperatures and more consistent performance compared to metal-tube systems that absorb and retain engine-bay heat.

The included SF Airbox transforms the SF intake into a cold air system, sealing off the filter from hot engine air while still using the OEM snorkel to feed fresh air from the grille. This design eliminates the water-ingestion issues found in traditional fender-mount cold air intakes and maintains safe, reliable airflow in all weather conditions.

All 2008+ Subaru aftermarket intakes require tuning for proper MAF calibration, and COBB provides Accessport Off-The-Shelf Maps so you can simply install, flash, and drive with confidence.

Key Features & Benefits

• Designed specifically for 2015–2018 Subaru WRX STI models

• Composite intake body provides exceptional heat rejection

• Integrated velocity stack for optimal airflow efficiency

• Airflow straightener grid stabilizes MAF readings for precise tuning

• Pre-oiled, cleanable, reusable COBB filter element

• Includes SF Airbox to provide cold-air performance

• Retains the OEM snorkel for direct cold-air feed

• Eliminates dead airflow zones and reduces turbulence

• Offers CAI benefits without risk of water ingestion

• Proven compatibility with COBB Accessport SF Intake OTS maps

Technical Specs / Material Info

• Intake Body Material: High-temperature plastic composite

• Filter: Pre-oiled, reusable cotton element

• Design: Velocity stack + airflow straightener, sealed airbox

• Tuning Required: Yes — Accessport OTS maps available

• Air Feed: Uses factory snorkel

• Style: Short Ram & Cold Air Intake Hybrid System

Installation Info

• Direct bolt-on installation

• Requires tuning with COBB Accessport for proper MAF scaling

• No cutting or permanent modification required

• Airbox seals to OEM snorkel inlet

• Typical install time: 1–2 hours

Any Special Notes or Emissions Info

• Tuning Required: All 2008+ Subaru intakes require ECU calibration

• Not CARB-certified for California emissions compliance unless otherwise noted

• Designed for STI models only (not WRX)