Description
The Mishimoto Subaru WRX/STI Performance Air Intake (MMAI-STI-08WBK) is a purpose-built cold air intake designed specifically to replace the restrictive factory airbox on 2008+ WRX and STI models. Finished in a durable Wrinkle-Black powder coat, this mandrel-bent aluminum intake pipe pairs a CNC-machined mass airflow sensor housing with a Mishimoto air straightener to keep MAF readings accurate and the power band smooth. Mishimoto engineers spent months dyno-tuning this exact design, and the result is a dyno-proven 25 hp and 25 tq gain over the OEM intake at 5300 rpm while maintaining safe air/fuel ratios.
As a true cold air intake system, this kit relocates the free-flowing air filter outside the hot engine bay and shields it with a powder-coated heat shield to reduce intake air temperatures and prevent heat soak. The included Mishimoto oiled air filter offers 16-percent greater surface area than the factory unit for optimal airflow and thorough filtration of dirt and debris, and because it’s a serviceable cotton filter, it’s built for a lifetime of reuse rather than one-time disposal. Whether you’re chasing quick bolt-on horsepower for street driving or looking to sharpen throttle response on the autocross course, this air intake filter setup works with the factory tune, installs in under an hour, and rewards you with a noticeably richer, more aggressive intake tone compared to the stock air intake.
Vehicle Applications
This Mishimoto cold air intake is a direct fit for the 2008-2014 Subaru Impreza WRX and 2008-2014 Subaru Impreza WRX STI, covering WRX trims such as Premium (2009-2014), Limited (2010-2014), GT (2010), and SE (2010), as well as STI Special Edition (2010) and STI Limited (2011-2014) models. It also fits the later-generation 2012-2014 WRX Base, 2013-2014 WRX Limited, 2014 WRX SE, 2012-2014 WRX STI, and 2013-2014 STI Base, Sport-tech, and Tsurugi Edition variants. Additionally, this intake is compatible with the 2009-2013 Subaru Forester XT lineup, including the Forester XT (2009), Forester XT Limited (2009-2010, 2012-2013), Forester XT Premium (2010-2013), Forester XT Sports (2010-2012), and Forester XT Touring (2011-2013), all of which use the EJ255 or EJ257 engine codes and GE, GH, or GR chassis codes.
Features
- Direct fit for the 2008-2014 Subaru WRX/STI and 2009-2013 Subaru Forester XT
- Dyno-proven gains of 25 hp/25 tq at 5300 rpm
- Eliminates restrictions and improves airflow versus the factory air intake
- Mandrel-bent aluminum intake pipe with air straightener and CNC-machined MAF housing
- Powder-coated heat shield with protective edging for optimal air temperatures
- Mishimoto free-flowing air filter provides 16-percent greater filter surface area
- True cold-air design with filter placement outside the engine bay
- Fully serviceable oiled air filter
- Produces an aggressive, rich intake tone
- Bolt-on performance that works with the stock tune and installs in under one hour
- Designed in Delaware, USA, with the filter made in the USA
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMAI-STI-08WBK
- Filter Material: Multi-layered cotton
- Filter Color: Red
- Hose Material: Aluminum
- Hose Color: Black
- Finish: Powder-Coat
- Color: Wrinkle Black
- Grade Type: Performance
- CARB EO Number: D-759-3
- Air Filter Part Number: MMAF-2757
- Includes: (1) Aluminum Intake Pipe, (1) High-Flow Oiled Filter, (1) Heat Shield w/ Protective Edging, (1) Silicone Coupler, (1) Rubber Mounting Isolator, Hardware, Mishimoto Lifetime Warranty
Frequently Asked Questions
How much power does the Mishimoto Subaru WRX/STI Performance Air Intake add?
This intake is dyno-proven to add 25 hp and 25 tq at 5300 rpm over the OEM intake while maintaining safe air/fuel ratios.
Which Subaru models fit this cold air intake?
It fits the 2008-2014 Subaru Impreza WRX and WRX STI (including Premium, Limited, GT, SE, Special Edition, Base, Sport-tech, and Tsurugi Edition trims across those years) as well as the 2009-2013 Subaru Forester XT, including its Limited, Premium, Sports, and Touring trims.
Does this intake require a tune to run properly?
No, it works with the factory tune and installs in under one hour.
What comes included in the kit?
The kit includes an aluminum intake pipe, a high-flow oiled filter, a heat shield with protective edging, a silicone coupler, a rubber mounting isolator, and all necessary hardware, backed by the Mishimoto Lifetime Warranty.
How often should I service the air filter?
Mishimoto recommends cleaning and re-oiling the oiled air filter every 10,000-15,000 miles during normal driving, and inspecting it more often if driving in dusty or off-road conditions. Filter re-oiling is not covered by the Lifetime Warranty.
Does this intake have a CARB EO number?
Yes, this intake carries CARB EO Number D-759-3.
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.
