Carbon Fiber Subaru STI Brake Cooling Ducts 2018-2021

The Carbon Fiber Subaru STI Brake Cooling Ducts (2018–2021) by APR Performance are purpose-built to increase airflow to the front brake system, ensuring optimal cooling and fade resistance under high-performance driving conditions. Designed for both track and street applications, these ducts harness the Venturi effect — where air pressure and velocity increase as it funnels through a narrow section — to deliver a concentrated stream of cool air to the brake rotors.

By efficiently channeling air from the vehicle’s front end, these ducts reduce excessive heat buildup that can cause damage to rotors, calipers, and pads. This results in improved braking consistency, longevity, and overall performance.

Each unit is manufactured using pre-preg carbon fiber reinforced polymer (CFRP) and autoclave-cured for maximum strength, minimal weight, and superior heat resistance. Finished with a UV-resistant clear coat, they combine functionality with a race-inspired carbon aesthetic that complements the aggressive stance of the 2018–2021 STI.

When paired with high-temperature hoses (not included), this system becomes a complete cooling solution for demanding driving environments.

Key Features

• Pre-Preg Carbon Fiber Construction – Autoclave-cured CFRP offers lightweight strength and heat resistance.
• Venturi-Optimized Airflow Design – Funnels and accelerates airflow to improve brake rotor cooling.
• Reduced Brake Fade – Maintains braking performance during extended high-speed driving.
• UV-Resistant Gloss Finish – Protects against environmental elements and enhances carbon weave appearance.
• Precision Fitment – Designed specifically for the 2018–2021 Subaru STI for OEM-like integration.
• Track-Tested Durability – Engineered for consistent performance in extreme conditions.

Specifications

• Material: Pre-Preg Carbon Fiber Reinforced Polymer (CFRP)
• Finish: UV-Protected Gloss Clear Coat
• Construction: Autoclave-Formed Composite
• Installation: Direct-fit design; hoses not included
• Brand: APR Performance
• Category: Cooling / Brake System

Fitment

• Subaru WRX STI (2018–2021)