Mishimoto 2015+ Subaru STi Performance Cold-Air Intake System, Part 4: Race Intake System

Published: February 03, 2015 Updated: June 01, 2026

Subaru STi Intake 2015+

# turbo, teammishi, subaru, sti, scca, mishimoto, intake, featured, fast, ej25, ej, 2015

Key takeaways

Performance air intake for the Subaru. Reduces intake restriction and improves airflow compared to stock system for increased power and throttle response.
Measurable power and torque gains. Optimized filter, ducting, and piping deliver mid-range power improvements with quicker spool-up for turbocharged applications.
Plug-and-play installation without tuning. Direct-fit design bolts onto stock mounting points; no cutting, fuel-system modifications, or check-engine light concerns.
Validated for real-world use and durability. Mishimoto flow-bench tests all intakes at its USA facility and validates performance with factory ECU calibration and warranty.

Interested in purchasing our 2015 STi intake system? Check out more details on our product page linked below!

Mishimoto Subaru STI Performance Air Intake

As noted earlier in this article series, we would be tackling a race intake system to go along with our bolt-on unit. So what makes the race system different? For this particular system we are using a larger-diameter intake pipe with a larger MAF housing. This means greater intake flow, but it also means it will no longer function with the factory tune. This system is meant specifically for drivers who want aggressive professional tunes so they can take advantage of airflow modifications such as larger turbochargers and high boost pressures.

Because the 15' model shares the EJ from the previous generation, we would be using the same intake pipe and filter as we did with our 2008-2014 kit. This unit is shown below.

So, all we truly needed was to design an airbox that would accommodate this pipe and function with the body of the new 15' model.

We hit Solidworks and came up with the design you see below!