Why Upgrade Your 86/BRZ/FR-S with the AEM 21-817C?
Because the FA20 wakes up dramatically with better breathing.
The 21-817C gives you:
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Improved airflow over the restrictive factory box
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Faster throttle response
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More consistent top-end performance
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Deep, aggressive induction noise that actually makes the flat-four sound alive
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AEM Dryflow filter (washable, no oil, no MAF issues)
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Clean powder-coated aluminum intake tube for an OEM+ look
On the FA20, even small airflow improvements translate to noticeably sharper response, especially above 4,500 rpm.
The AEM 21-817C 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 specific Hyundai Elantra Sport models. AEM is a popular choice due to being CARB legal and following the law.
Key Features of the AEM 21-817C Cold Air Intake
🌀 Mandrel-Bent Aluminum Intake Tube
Smooth, precision-shaped piping designed to maintain proper MAF scaling for the FA20.
🧼 AEM Dryflow Air Filter
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Washable and reusable
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Oil-free (your MAF thanks you)
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High-flow filtration for long-term performance
❄ Improved Intake Placement
Designed to draw cooler air from the front of the engine bay while reducing heat soak.
🔧 OEM-Compatible Install
Utilizes factory mounting points and sensor connections for clean fitment without cutting or splicing.
🎧 Better Sound, No Drone
Hear that flat-four inhale when you get on it — without destroying daily drivability.
The oversized cone-shaped AEM dry flow filter is made from an oil-free, synthetic filter media and can be used for up to 100, 000 miles before cleaning is needed (depending on driving conditions). this system puts the air filter low and towards the front of the car where cooler air can be found.
Performance Gains on the FA20 Platform
Most FA20 owners report:
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Sharper throttle response
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Smoother midrange pull
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Better top-end breathing
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A much sportier intake tone
Pair it with an axle-back and a tune and your 86/BRZ feels noticeably more responsive and enjoyable.
The cooler and denser air is then channeled through the mandrel-bent aluminum intake tube into the throttle body.
Daily-Driver Friendly
The 21-817C keeps things simple:
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No tune required, though it does complement aftermarket tunes perfectly
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Dry filter = reduced maintenance and zero oil contamination risks
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Street-safe airflow scaling prevents CEL issues when installed correctly
This intake is built for enthusiasts who want a real improvement without turning the car into a science experiment.
The factory PCV and vent hoses mount directly on the intake tube using the existing spring clamps. The air intake system is backed by AEM lifetime limited warranty.
Installation Overview
Expect about 45–75 minutes with basic hand tools.
You’ll:
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Remove the factory airbox and snorkel
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Install the AEM heat shield
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Bolt in the aluminum intake tube
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Add the Dryflow filter
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Transfer the MAF
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Tighten everything and enjoy the new soundtrack
No cutting. No drilling. No drama.
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 21-817C vehicle applications to determine the legal status for each vehicle.
Omar –
Easy to install, the instructions are easy to understand. I feel the difference instantly when I turn the car on. It have the power that I expected.