Mishimoto MMAI-STI-15P Subaru STI Performance Cold-Air Intake Kit Polished

The Mishimoto MMAI-STI-15P is a direct-fit performance cold-air intake system engineered specifically for the 2015–2017 Subaru WRX STI. Designed to replace the restrictive factory airbox, this intake delivers significantly improved airflow to the turbocharged EJ257 engine, unlocking real, measurable power gains of 20+ wheel horsepower and 18 lb-ft of wheel torque under optimal conditions.

Key Features:

• Direct-Fit Design: Bolt-on installation engineered specifically for 2015–2017 Subaru STI — no cutting or fabrication required
• Significant Power Gains: Maximum recorded gains of 20+ whp and 18 wtq over the restrictive OEM airbox
• Polished Finish: Sleek polished aluminum piping for a clean, show-quality engine bay appearance
• Integrated Heat Shield: Included heat shield isolates the intake tract from radiant engine heat, helping to maintain cooler, denser intake air temperatures
• High-Flow Air Filter: Made in the USA for long service life and exceptional filtration efficiency
• Noise Generator Cap: Rubber cap supplied to block the OEM noise generator port for a cleaner install
• Designed in Delaware, USA: Engineered and developed at Mishimoto's headquarters in Newark, Delaware
• Mishimoto Lifetime Warranty: Backed by Mishimoto's industry-leading lifetime warranty for worry-free ownership

The Mishimoto MMAI-STI-15P is an ideal upgrade for Subaru STI owners seeking a bolt-on performance improvement that combines dyno-proven power gains with premium build quality and long-term reliability.