Description
The Mishimoto Performance Air Intake (MMAI-STI-15WBK) is a purpose-built cold air intake engineered exclusively for the 2015-2017 Subaru WRX STI, replacing the restrictive factory airbox with a mandrel-bent aluminum intake pipe and a Mishimoto free-flowing oiled air filter. This is a dyno-proven air intake system, developed over months of engineering to add real, measurable power while keeping air/fuel ratios safe.
As a true performance cold air intake, this kit is designed to move more air, more efficiently, into your STI’s EJ257 engine. The mandrel-bent aluminum intake pipe pairs with a Mishimoto air straightener and a CNC-machined mass airflow sensor housing to deliver accurate, consistent MAF readings for a smoother power band, while relocating the air intake filter outside the hot engine bay — combined with a powder-coated heat shield — helps keep intake air temperatures down and heat-soak at bay. The included Mishimoto oiled air filter offers 16% greater surface area than stock for optimal airflow and proper filtration, and because it’s a serviceable intake filter, it’s built for a lifetime of reliable use with periodic cleaning and re-oiling. Whether you’re chasing extra punch on the street or shaving time on the autocross course, this air intake works perfectly with the stock tune and adds a noticeably more aggressive, rich intake tone over the factory setup.
Vehicle Applications
This Mishimoto cold air intake is engineered as a direct-fit upgrade for the 2015-2017 Subaru WRX STI, VA-chassis, EJ257-equipped lineup. Coverage spans the standard WRX STI (2015-2016), the WRX STI Base and Limited trims (2015-2017), the 2015 WRX STI Launch Edition, the 2016 WRX STI Series.HyperBlue, and the 2017 WRX STI Sport and Sport-tech models.
Features
- Direct fit for 2015-2017 Subaru WRX STI
- Dyno-proven gains of up to 20 whp and 18 wtq over the stock intake
- Mandrel-bent aluminum intake pipe available in polished, wrinkle black, or wrinkle red finish
- Mishimoto air straightener and CNC-machined MAF housing for accurate, consistent sensor readings
- Powder-coated heat shield with protective edging to reduce intake air temperatures and heat-soak
- Mishimoto oiled air filter with 16% greater surface area than stock and multi-layered cotton filter media; fully serviceable
- Includes silicone coupler, rubber mounting isolator, clamps, and all hardware for bolt-on installation
- Rubber cap included for the sound symposer housing
- Installs in under one hour and works perfectly with the stock tune
- Designed in Delaware, USA, with a filter made in the USA
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Filter material: Multi-layered cotton
- Filter color: Red
- Filter diameter: 2.75 in.
- Air filter part number: MMAF-2757
- Hose/pipe material: Aluminum
- Hose color: Black
- Finish: Wrinkle
- Grade type: Performance
- Applications: 2015-2017 Subaru STI
- Engine code: EJ257
- Chassis code: VA
- CARB EO Number: D-759-3 (covers model years 2015-2017)
- Kit includes: (1) aluminum intake pipe, (1) high-flow oiled filter, (1) heat shield with protective edging, (1) silicone coupler, (1) rubber mounting isolator, (1) sound generator cap, hardware, and Mishimoto Lifetime Warranty
Frequently Asked Questions
How much power does the Mishimoto Performance Air Intake add to a 2015-2017 STI?
This dyno-proven cold air intake provides up to 20 whp and 18 wtq gains over the stock intake while maintaining safe air/fuel ratios.
Do I need to retune my car after installing this intake?
No. The Mishimoto Performance Air Intake works perfectly with the stock tune.
What finishes are available for the intake pipe?
The mandrel-bent aluminum intake pipe is available with a red or black powder-coated (wrinkle) finish or a polished aluminum finish.
How long does installation take?
The kit includes everything needed for installation and installs in under one hour.
Is the included air filter reusable?
Yes. The Mishimoto oiled air filter is completely serviceable, allowing for a lifetime of reliable use. Mishimoto recommends cleaning and re-oiling the filter every 10,000–15,000 miles during normal driving, and inspecting/servicing it more often in dusty or off-road conditions. Filter re-oiling is not covered under the Lifetime Warranty.
Which Subaru WRX STI models fit this intake?
This intake fits the 2015-2016 Subaru WRX STI, the 2015-2017 WRX STI Base and Limited trims, the 2015 WRX STI Launch Edition, the 2016 WRX STI Series.HyperBlue, and the 2017 WRX STI Sport and Sport-tech, all VA-chassis models with the EJ257 engine.
⚠ 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.
