Description
The Mishimoto Performance Air Intake, part number MMAI-STI-15WRD, is a purpose-built cold air intake engineered exclusively for the 2015-2017 Subaru STI. Finished in a striking wrinkle red powder coat, this mandrel-bent aluminum intake pipe replaces the restrictive factory airbox with a dyno-proven system that Mishimoto’s engineers spent months fine-tuning for real gains without sacrificing driveability. It’s a direct-fit air intake system designed in Delaware, USA, that bolts on in under an hour and works with the stock tune.
This cold air intake was developed to add horsepower and torque while keeping air/fuel ratios safe, delivering up to 20 whp and 18 wtq over the stock intake. The kit relies on a Mishimoto air straightener paired with a CNC-machined mass airflow sensor housing to keep MAF readings accurate and consistent, which helps produce a smooth, predictable power band rather than a spikey one. To combat rising intake air temperatures, the free-flowing air filter is positioned outside the hot engine bay and shielded by a powder-coated heat shield with protective edging, reducing heat soak so the intake filter can pull in cooler, denser air. The Mishimoto oiled air filter itself offers 16% greater surface area than the factory piece for optimal airflow and dirt/debris filtration, and because it’s fully serviceable, this air intake filter is built for a lifetime of reliable use. As a bonus, drivers get a noticeably more aggressive intake tone, with a rubber cap included to place over the sound symposer housing if you’d rather quiet things down.
Vehicle Applications
This Mishimoto intake is designed as a direct fit for the Subaru WRX STI, covering the 2015-2016 model years, along with the STI Base and STI Limited trims for 2015-2017. It also fits the 2015 STI Launch Edition, the 2016 STI Series.HyperBlue, and the 2017 STI Sport and Sport-tech trims. All applications use the EJ257 engine code on the VA chassis, and CARB Executive Order D-759-3 currently covers these 2015-2017 model years.
Features
- Direct fit for 2015-2017 Subaru STI
- Dyno-proven for gains of up to 20 whp and 18 wtq over the stock intake while maintaining safe air/fuel ratios
- Mandrel-bent aluminum intake pipe finished in wrinkle red
- Mishimoto air straightener and CNC-machined MAF housing for accurate, consistent readings and a smooth power band
- Powder-coated heat shield with protective edging reduces heat soak and lowers intake air temperatures
- Free-flowing oiled air filter offers 16% greater surface area and is fully serviceable
- Rubber cap included for the sound symposer housing
- Installs in under one hour and works with the stock tune
- Designed in Delaware, USA; filter made in USA
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Part Number: MMAI-STI-15WRD
- Hose Material: Aluminum
- Hose Color: Red
- Finish: Wrinkle
- Filter Material: Multi-layered cotton
- Filter Color: Red
- Filter Diameter: 2.75 in.
- Air Filter Part Number: MMAF-2757
- Grade Type: Performance
- Engine Code: EJ257
- Chassis Code: VA
- CARB EO Number: D-759-3
- Kit Includes: Aluminum intake pipe, high-flow oiled filter, heat shield with protective edging, silicone coupler, rubber mounting isolator, sound generator cap, hardware, and Mishimoto Lifetime Warranty
Frequently Asked Questions
What performance gains does this Mishimoto cold air intake provide?
This dyno-proven intake provides gains of up to 20 whp and 18 wtq over the stock intake while maintaining safe air/fuel ratios.
Which vehicles does the Mishimoto MMAI-STI-15WRD air intake fit?
It fits the 2015-2016 Subaru WRX STI, the 2015-2017 STI Base and Limited trims, the 2015 STI Launch Edition, the 2016 STI Series.HyperBlue, and the 2017 STI Sport and Sport-tech trims. These vehicles use the EJ257 engine on the VA chassis.
Does this air intake require a tune?
No, this intake kit works perfectly with the stock tune.
How long does installation take?
The Mishimoto Performance Air Intake includes everything needed for installation and installs in under one hour.
Is the air filter reusable, and how should it be maintained?
Yes, the included Mishimoto oiled air filter is completely serviceable. Mishimoto recommends cleaning and re-oiling the filter every 10,000-15,000 miles during normal driving, and servicing it more often in dusty or off-road conditions. Filter re-oiling is not included in the Lifetime Warranty.
What is included in the kit?
The kit includes one aluminum intake pipe, one high-flow oiled filter, one heat shield with protective edging, one silicone coupler, one rubber mounting isolator, one sound generator cap, hardware, and the Mishimoto Lifetime Warranty.
âš WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
