| Year | Make | Model |
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| 2014 - 2020 | Subaru | Legacy |
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AEM 17-18 Subaru Legacy H4-2.5L F/I Cold Air Intake | Subaru Legacy (17-18) (21-856C)
AEM 17-18 Subaru Legacy H4-2.5L F/I Cold Air Intake | Subaru Legacy (17-18) (21-856C)
SKU:21-856C
In stock
Regular price
$380.07 USD
Regular price
$419.99 USD
Sale price
$380.07 USD
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The AEM C.A.S. 17-18 Subaru Legacy H4-2.5L F/I Cold Air Intake is a performance upgrade designed to enhance airflow and engine efficiency. This system replaces the restrictive factory air filter and intake housing, allowing for increased horsepower and torque. Constructed with an oversized AEM Dryflow synthetic washable air filter, it ensures superior airflow, filtration, and durability. The inclusion of a heat shield helps reduce intake air temperature, further optimizing engine performance. Engineered, tuned, and dyno-tested for precise fitment, this intake system delivers improved throttle response and overall engine responsiveness, making it an ideal upgrade for enthusiasts seeking better performance.
Designed specifically for 2017-2018 Subaru Legacy models with the H4 2.5L fuel-injected engine, this cold air intake is a direct bolt-on replacement that maintains the factory air box location. It is suitable for street and performance driving, providing a straightforward installation process. The kit includes the intake tube, heat shield, and washable air filter, ensuring a complete upgrade. Compatible with models equipped with the specified engine, this intake system enhances airflow without requiring additional modifications, making it a reliable choice for improving engine efficiency and power output in daily or spirited driving scenarios.
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Overview
Overview
AEM Induction Cold Air Intake System
Fits 2017–2018 Subaru Legacy with 2.5L H4 Engine
Part #: 21-856C
Overview
The AEM Cold Air Intake System is designed to enhance the airflow to your Subaru Legacy's engine, helping to improve horsepower and torque. Crafted specifically for 2017 and 2018 models with the 2.5L H4 engine, this intake offers a straightforward upgrade for enthusiasts seeking better performance and a more aggressive engine sound. Its design focuses on maximizing airflow while maintaining filtration efficiency, making it an ideal choice for drivers looking to optimize their vehicle’s responsiveness and overall driving experience.Key Features
This intake system features a high-quality synthetic washable air filter and a custom heat shield to protect against under-hood heat, ensuring consistent airflow and filtration. The system is engineered for easy installation, fitting seamlessly into the factory air box space without requiring modifications. Its durable construction and precise tuning help support improved throttle response and engine efficiency, making it a reliable upgrade for daily driving or spirited runs.
Construction & Design
The system incorporates a large-diameter intake tube and a high-flow synthetic filter, designed to reduce air restriction and promote better airflow. The heat shield is engineered to minimize heat soak from the engine bay, helping to keep intake air cooler and denser for improved combustion. The materials used are selected for durability and long-term performance, ensuring the intake remains effective over time.
Installation & Fitment
Designed for a direct bolt-on installation, this intake system fits perfectly into the factory air box location of your Subaru Legacy. It requires no cutting or welding, allowing for a straightforward upgrade process that can typically be completed with basic hand tools.
What’s Included
The package includes the oversized washable synthetic air filter, heat shield, intake tube, and all necessary hardware for installation.
