AEM 21-478C Air Intake Kit 024844391216 2.5L

( Brand: Aem ), ( Manufacturer Part Number: 21-478C ), ( Part Type: Intake ), ( Material: Aluminum ), ( Performance Part: Yes ), ( Universal Fitment: No ), ( Manufacturer Warranty: Lifetime ), ( Country Of Origin: United States ), ( UPC: 024844391216 )

Review AEM Cold Air Intake Kit System For Subaru 2.5l fits IMPREZA WRX STI 2008–2014

The AEM 21-478C Air Intake Kit is a high-performance upgrade for your 2008-2014 Subaru Impreza WRX STI with a 2.5L engine. This intake system is designed to provide your Subaru with improved airflow, enhanced engine performance, and increased power.

The heart of this intake kit is the 21-478C cold air intake housing. This component is constructed from high-density, closed-cell polyurethane, which is both lightweight and resilient. The housing is also equipped with a large, conical air filter, which is designed to capture and trap airborne contaminants while allowing for maximum airflow. The filter is easily accessible through a large, tool-less opening, making it simple to clean or replace.

The intake system also features a unique, dual-pass design. This means that the air is drawn in from the driver's side of the vehicle, then passes through the air filter before entering the engine. After exiting the engine, the air is drawn in again from the passenger side, passing through the filter once more before being recirculated back into the engine. This design helps to ensure that the engine always receives a consistent supply of cool, clean air, even under heavy load or during high-speed driving.

The AEM 21-478C Air Intake Kit also includes all necessary hardware for installation, including a replacement MAF sensor and a heat shield. The kit is designed to be a direct replacement for the factory intake system, making installation straightforward and hassle-free. Additionally, the intake tube is routed to avoid interference with the steering rack, making it a great choice for those looking for both performance and ease of installation.

In summary, the AEM 21-478C Air Intake Kit is an excellent choice for Subaru Impreza WRX STI owners looking to improve their vehicle's performance. With its high-flow design, durable construction, and easy installation, this intake system is sure to provide a noticeable increase in power and torque, while also improving engine response and overall drivability.

The AEM 21-478C Air Intake Kit for 2008-14 Subaru Impreza WRX STI 2.5L is a performance upgrade that promises to deliver increased horsepower and torque. Here are some pros and cons to help you make an informed decision:

1. Increased power: The AEM air intake kit is designed to provide better air flow to the engine, which can lead to an increase in horsepower and torque.

2. Improved engine sound: The cold-air intake system can produce a more aggressive engine sound, which is a desirable feature for many Subaru WRX STI owners.

3. Better throttle response: With the AEM air intake kit, you can expect improved throttle response, which can make your driving experience more enjoyable.

4. Easy installation: The kit comes with all the necessary hardware for installation, and the process is relatively straightforward.

5. High-quality materials: AEM uses high-quality materials in their air intake kits, ensuring durability and reliability.

1. Cost: The AEM air intake kit is not an inexpensive upgrade, and the cost may be a deterrent for some buyers.

2. Maintenance: The cold-air intake system requires occasional filter cleaning or replacement, which can add to the cost and inconvenience.

3. Potential for increased noise: While some people enjoy the aggressive engine sound produced by the cold-air intake system, others may find it too loud for their liking.

4. Fitment issues: There have been reports of fitment issues with the AEM air intake kit on certain Subaru models, so it's essential to ensure compatibility before making a purchase.

The AEM 21-478C Air Intake Kit for 2008-14 Subaru Impreza WRX STI 2.5L is a high-performance upgrade that can deliver increased power, improved throttle response, and a more aggressive engine sound. However, it comes with a higher cost and the potential for increased noise and fitment issues. If you're looking for a significant power boost and don't mind the added cost and maintenance, then this kit may be worth considering. Otherwise, it may be better to explore other performance upgrades that fit your budget and preferences. Ultimately, the decision is yours to make based on your individual needs and priorities.

Details:

A custom heat shield helps protect intake air from the high temperature of your engine, and factory fresh duct attaches. Replaces factory air filter and intake tube. The entire system can typically be installed in less than 90 minutes.

The oversized, conical filter design allows you to go up 100,000 miles between services under normal highway driving conditions. Cross References: No cross references found for this part. May vary between actual products. Mandrel-bent aluminum intake tube paired with an oversized dry air filter.

Will not void vehicle warranty. Guaranteed to increase horsepower and torque. AEM Lifetime Limited Warranty. AEM 21-478C Cold Air Intake Kit System for 2008 14 Subaru Impreza WRX / STi 2.5L: cold air intake systems are designed to increase horsepower and torque.

part #: 21478c prices

• $285.43-$293.99

specifications airfueldepo:

• for models: Wrx, Sti, Impreza
• for makes: Subaru
• for years: 2008-2014
• brand: Aem
• mpn: 21-478c
• part type: Intake
• material: Aluminum
• performance part: Yes
• universal fitment: No
• manufacturer warranty: Lifetime
• country of origin: United States
• upc: 024844391216

seller airfueldepo:

• rating: 100.0%
• # reviews: 6770
• city: Multiple Warehouses

general airfueldepo:

• Car Truck Parts Accessories > Air Fuel Delivery > Other Air Fuel Delivery
• condition: New

offer airfueldepo:

• started: February 28, 2026
• sold: 0
• options: Ship-to-home
• quantity: 6
• availability: In Stock

payments airfueldepo:

• credit card: Mastercard
• other
• wallet: Apple-pay

returns airfueldepo:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

shipping airfueldepo:

• transit: 3-5 Days
• class: Standard
• type: Fixed
• carrier: UPS
• service: UPS Ground
• cost: $0.00

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