Mishimoto MMAI-STI-15WBK Wrinkle Black Cold Air Intake for 2015–2017 Subaru WRX STI

The Mishimoto MMAI-STI-15WBK Cold Air Intake System for the 2015–2017 Subaru WRX STI is engineered to unlock significant power gains while maintaining safe air-fuel ratios on the stock tune. Designed specifically for the EJ-powered STI platform, this intake replaces the restrictive factory airbox with a precision-built system that improves airflow and boosts engine performance.

Dyno-proven testing shows gains of up to 20 whp and 18 wtq, thanks to a free-flowing, mandrel-bent aluminum intake pipe paired with a high-surface-area oiled air filter. Mishimoto’s engineered air straightener and CNC-machined MAF housing ensure consistent and accurate MAF readings, providing a smooth and reliable power curve.

The included heat shield isolates the filter from engine bay heat to prevent heat-soak, while the intake’s placement helps reduce IATs for improved performance. This kit installs in under an hour and works perfectly with the factory tune. A sound generator cap is included to eliminate the OEM symposer noise tube, resulting in a cleaner engine bay and more refined intake sound.

Designed in Delaware and backed by the Mishimoto Lifetime Warranty, this intake delivers dependable, bolt-on performance gains and an aggressive induction tone.

Key Features and Benefits

• Direct fit for 2015–2017 Subaru WRX STI

• Up to 20 whp and 18 wtq gains on the stock tune

• Mandrel-bent aluminum intake pipe

• Wrinkle black powder-coated finish

• CNC-machined MAF housing for accurate sensor readings

• Mishimoto air straightener ensures smooth airflow past the MAF

• Designed to maintain safe air/fuel ratios

• High-flow, serviceable oiled air filter with 16% more surface area

• Heat shield included to reduce intake air temperatures

• Rubber cap supplied for sound symposer delete

• Aggressive, rich intake tone under throttle

• Installs in under one hour

• Includes silicone coupler, isolator mount, clamps, and hardware

• Designed in Delaware, USA; filter made in the USA

• Mishimoto Lifetime Warranty

Package Contents

• (1) Aluminum Intake Pipe (Wrinkle Black)

• (1) High-Flow Oiled Filter

• (1) Powder-Coated Heat Shield with Protective Edging

• (1) Silicone Coupler

• (1) Rubber Mounting Isolator

• (1) Sound Generator Cap

• Hardware

• Mishimoto Lifetime Warranty

Technical Specs / Material Info

• Intake Pipe Material: Mandrel-bent aluminum

• Filter: Oiled, serviceable, high-flow air filter

• Finish: Wrinkle black powdercoat

• Tuning Required: No

• Maximum Gains: 20 whp / 18 wtq

• Warranty: Mishimoto Lifetime Warranty

Installation Info

• Direct bolt-on install

• Under 1 hour installation time

• Works safely with stock ECU calibration

• Includes all required clamps, mounts, and hardware

Special Notes / Emissions Info

• Not CARB exempt

• Not legal for sale or use in California

• Fits 2015–2017 Subaru WRX STI only (EJ257 engine)