AEM Induction 21-786C Performance Cold Air Intake System for Mazda MX-5 Miata 2.0L

The AEM-21-786C Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle's restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno-tested to fit select Mazda MX-5 Miata models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is located in the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower. Attached to the heat shield is an aluminum coolant overflow reservoir that replaces the stock reservoir so that the air intake will fit properly. The air intake tubing is constructed from mandrel-bent aluminum featuring a durable gunmetal gray powder coated finish. This air intake system was developed to accommodate the engine's factory emissions control devices including the mass air flow sensor and PCV hose. The tapered cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). The air intake system is easy to install with commonly available tools. 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. View the 21-786C vehicle applications to determine the legal status for each vehicle. AEM's Performance Cold Air Intake Systems are designed, tuned and dyno-tested to give your engine more power and acceleration by replacing the restrictive factory air filter, air intake tubing and air box assembly. Associated products: AEM-21-2157DK DryFlow Air Filter, AEM-1-1000 Air Filter Cleaner

• Low restriction aluminum tubing
• AEM Lifetime Limited Warranty

The AEM Induction 21-786C Performance Cold Air Intake System is designed for select 2016–2018 Mazda MX-5 Miata models equipped with the 2.0L four-cylinder engine. By replacing the restrictive factory air filter, intake tubing, and air box assembly, this system helps improve airflow, throttle response, horsepower, torque, and acceleration. Each intake is engineered, tuned, and dyno-tested for application-specific performance.

The system uses an oversized AEM Dryflow synthetic washable air filter positioned within the original air box area. Its oil-free filter media provides efficient filtration and high airflow, with cleaning intervals of up to 100,000 miles depending on driving conditions. A protective heat shield helps reduce exposure to engine-bay heat, while the included aluminum coolant overflow reservoir supports proper installation and replaces the factory reservoir.

Mandrel-bent aluminum intake tubing features a durable gunmetal gray powder-coated finish and low-restriction airflow characteristics. The 21-786C is designed to retain compatibility with the factory mass airflow sensor, PCV hose, and emissions control components. Installation can be completed with commonly available hand tools. This product is not CARB approved and may not be legal for sale or use in California or other states that follow California emissions regulations; verify vehicle-specific requirements before purchase. AEM Induction backs the system with a Lifetime Limited Warranty.

Specifications and Technical Data

• Brand: AEM Induction
• Part Number: 21-786C
• Application: Performance cold air intake system
• Vehicle Fitment: Select 2016–2018 Mazda MX-5 Miata models
• Engine Compatibility: 2.0L inline four-cylinder
• Intake Material: Mandrel-bent aluminum tubing
• Filter Type: Oil-free, synthetic, washable AEM Dryflow filter
• Emissions Status: Not CARB approved; confirm local compliance requirements

What's Included

• Aluminum intake tube
• AEM Dryflow synthetic air filter
• Heat shield
• Aluminum coolant overflow reservoir
• Required installation hardware
• Installation instructions

Associated replacement products include the AEM 21-2157DK Dryflow Air Filter and AEM 1-1000 Air Filter Cleaner.

Features:

• Performance Airflow: Replaces restrictive factory intake components to help increase airflow, throttle response, horsepower, torque, and acceleration.
• Dryflow Filtration: Uses an oil-free, washable synthetic filter designed for high airflow and long service intervals of up to 100,000 miles depending on driving conditions.
• Heat Management: Includes a protective heat shield that helps reduce intake air temperatures by isolating the filter from engine-bay heat.
• Vehicle-Specific Design: Tuned for select Mazda MX-5 Miata models and retains compatibility with the factory mass airflow sensor, PCV hose, and emissions control components.

Fitments:
2016 Mazda MX-5 Miata Club
2016 Mazda MX-5 Miata Grand Touring
2016 Mazda MX-5 Miata Sport
2017 Mazda MX-5 Miata Club
2017 Mazda MX-5 Miata Grand Touring
2017 Mazda MX-5 Miata RF Club
2017 Mazda MX-5 Miata RF Grand Touring
2017 Mazda MX-5 Miata Sport
2018 Mazda MX-5 Miata Club
2018 Mazda MX-5 Miata Grand Touring
2018 Mazda MX-5 Miata RF Club
2018 Mazda MX-5 Miata RF Grand Touring
2018 Mazda MX-5 Miata Sport
2019 Mazda MX-5 Miata Club
2019 Mazda MX-5 Miata Grand Touring
2019 Mazda MX-5 Miata RF Club
2019 Mazda MX-5 Miata RF Grand Touring
2019 Mazda MX-5 Miata Sport
2020 Mazda MX-5 Miata 100th Anniversary Special Edition
2020 Mazda MX-5 Miata Club
2020 Mazda MX-5 Miata Grand Touring
2020 Mazda MX-5 Miata RF 100th Anniversary Special Edition
2020 Mazda MX-5 Miata RF Club
2020 Mazda MX-5 Miata RF Grand Touring
2020 Mazda MX-5 Miata Sport
2021 Mazda MX-5 Miata Club
2021 Mazda MX-5 Miata Grand Touring
2021 Mazda MX-5 Miata RF Club
2021 Mazda MX-5 Miata RF Grand Touring
2021 Mazda MX-5 Miata Sport
2022 Mazda MX-5 Miata Club
2022 Mazda MX-5 Miata Grand Touring
2022 Mazda MX-5 Miata RF Club
2022 Mazda MX-5 Miata RF Grand Touring
2022 Mazda MX-5 Miata Sport
2026 Mazda MX-5 Miata Club
2026 Mazda MX-5 Miata Grand Touring
2026 Mazda MX-5 Miata RF Club
2026 Mazda MX-5 Miata RF Grand Touring
2026 Mazda MX-5 Miata Sport

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1