K&N 69-8009TWR Typhoon Cold-Air Intake System for 2018-2021 Subaru WRX STI 2.5L

Vehicle Fitment

• 2018-2021 Subaru WRX STI (2.5L H4 FA20F, Turbo, AWD)

Features

• Mandrel-bent aluminum intake tube for improved airflow.
• Oversized washable/reusable cotton-gauze air filter.
• Textured red powder-coat finish on intake tube for durability.
• Application-specific heat shield included to deflect engine heat.
• Designed to increase horsepower and torque.
• Replaces restrictive factory air-intake system for better throttle response.
• Easy install with basic hand tools; typically under 90 minutes.
• No-Hassle Lifetime Limited Warranty from K&N.

Specifications

• Estimated horsepower gain: +25.2 HP @ 4800 RPM.
• Estimated torque gain: +11.4 lb-ft.
• Filter part number: RP-5113.
• Air filter color: Red.
• Intake pipe material: Aluminum.
• Intake pipe finish: Textured red powder coat.
• Weight: 8 lb (3.6 kg).
• Note: Not legal for sale or use in California on pollution-controlled motor vehicles.

Included Components

• 1x mandrel-bent aluminum intake tube
• 1x washable/reusable high-flow air filter (RP-5113 compatible)
• 1x application-specific heat shield
• Mounting hardware and clamps as required

Product Description

The K&N 69-8009TWR Typhoon Cold-Air Intake System is designed specifically for the 2018 to 2021 Subaru WRX STI equipped with the 2.5L FA20F turbocharged flat-four engine (AWD). This bolt-on system replaces the factory airbox and intake tubing with a high-flow aluminum tube and a premium cotton-gauze air filter, enabling your engine to breathe more freely and respond quicker to throttle inputs. Dyno testing revealed an estimated gain of +25.2 HP and +11.4 lb-ft of torque, so you'll feel an appreciable boost in both acceleration and mid-range throttle response.

Whether you drive your WRX STI on the street or take it to the track on weekends, this intake enhances your driving experience with improved sound, sharper throttle response, and a reusable filter you can clean instead of replacing. Installation is straightforward - typically takes under 90 minutes using common hand tools - and it retains the factory mass air flow sensor and mounting points, so no major modifications are necessary. Fitment confirmed through 2021; 2022-2025 coverage unconfirmed at time of listing.