The AEM 21-779C cold air intake system replaces the restrictive factory air filter and intake housing on specific Mazda 3, Mazda 6, and CX-5 2.5L models for gains in horsepower and torque. The system was designed, tuned, and dyno-tested for these applications, drawing air through an oversized AEM Dryflow synthetic washable filter that sits in the original air box location and is shielded by a heat shield to reduce intake air temperature. The mandrel-bent aluminum intake tube features a durable gunmetal gray powder-coated finish and is built to work with the factory mass airflow sensor and breather tube.
The tapered, cylinder-shaped AEM Dryflow air filter uses an oil-free synthetic media rated for up to 100,000 miles between cleanings, depending on driving conditions. The system installs with commonly available tools and is backed by AEM's Lifetime Limited Warranty.
Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards, while others are 50-state legal. Refer to the vehicle applications below to determine legal status for each vehicle.
Specifications:
- Engine: 2.5L
- Color: Gunmetal Gray Powder-Coated
- Filter Media: AEM Dryflow Synthetic (Oil-Free, Washable, up to 100,000 miles between cleanings)
- Tubing: Mandrel-Bent Aluminum
- Warranty: AEM Lifetime Limited Warranty
- Emissions: Legal status varies by state/model - confirm via vehicle application before purchase
- Part Number: 21-779C
Vehicle Applications
- 2014 Mazda 3 s Grand Touring
- 2014 Mazda 3 s Touring
- 2015 Mazda 3 s Grand Touring
- 2015 Mazda 3 s Touring
- 2016 Mazda 3 s Grand Touring
- 2016 Mazda 3 s Touring
- 2017 Mazda 3 Grand Touring
- 2017 Mazda 3 Touring
- 2018 Mazda 3 Grand Touring
- 2018 Mazda 3 Touring
- 2014 Mazda 6 Grand Touring
- 2014 Mazda 6 Sport
- 2014 Mazda 6 Touring
- 2015 Mazda 6 Grand Touring
- 2015 Mazda 6 Sport
- 2015 Mazda 6 Touring
- 2016 Mazda 6 Grand Touring
- 2016 Mazda 6 Sport
- 2016 Mazda 6 Touring
- 2017 Mazda 6 Grand Touring
- 2017 Mazda 6 Sport
- 2017 Mazda 6 Touring
- 2018 Mazda 6 Grand Touring
- 2018 Mazda 6 Signature
- 2018 Mazda 6 Sport
- 2018 Mazda 6 Touring
- 2019 Mazda 6 Grand Touring
- 2019 Mazda 6 Signature
- 2019 Mazda 6 Sport
- 2019 Mazda 6 Touring
- 2020 Mazda 6 Grand Touring
- 2020 Mazda 6 Signature
- 2020 Mazda 6 Sport
- 2020 Mazda 6 Touring
- 2021 Mazda 6 Sport
- 2021 Mazda 6 Touring
- 2015 Mazda CX-5 Grand Touring
- 2015 Mazda CX-5 Sport
- 2015 Mazda CX-5 Touring
- 2016 Mazda CX-5 Grand Touring
- 2016 Mazda CX-5 Sport
- 2016 Mazda CX-5 Touring
- 2017 Mazda CX-5 Grand Select
- 2017 Mazda CX-5 Grand Touring
- 2017 Mazda CX-5 Sport
- 2017 Mazda CX-5 Touring
FAQ
What vehicles does the AEM 21-779C fit?
It fits specific 2014-2018 Mazda 3, 2014-2021 Mazda 6, and 2015-2017 Mazda CX-5 2.5L models - see the Vehicle Applications list above for exact year/trim fitment.
Is the AEM 21-779C legal in all 50 states?
Legal status varies by vehicle. Some AEM air intakes are not legal for sale or use in California and other states that follow California emission standards, while others are 50-state legal - check the vehicle application for the specific model.
How often does the Dryflow filter need cleaning?
The oil-free Dryflow synthetic media is rated for up to 100,000 miles between cleanings, depending on driving conditions.