Skip to product information
1 of 9

AEM 19-21 Subaru WRX STI 2.5L H4 Cold Air Intake System

AEM 19-21 Subaru WRX STI 2.5L H4 Cold Air Intake System

SKU:AEM21-863C

Regular price $399.00
Regular price Sale price $399.00
(Duties & import taxes included)
Import Duties & Taxes

The displayed price includes import duties and taxes. In principle, no additional payment is required upon delivery. If the shipping carrier nevertheless charges you import duties or taxes upon delivery, please pay the charges first. Shaft Shop will reimburse you for the amount paid.

Sale Sold out
Shipping calculated at checkout.

In stock | Estimated delivery: 5–8 business days

International shipping rates are calculated at checkout.
Authorized U.S. Suppliers Sourced through authorized channels
Tracked International Shipping Track your shipment to your destination
Japanese & English Support Contact us about fitment and delivery
FAQs: Duties, Delivery & Fitment → View full details
AEM cold air intake systems are designed to increase horsepower and torque. The system includes a large, washable AEM DRYFLOW synthetic air filter engineered for superior airflow, filtration, and performance. It also features a mandrel-bent aluminum intake tube and high-quality hardware. The large conical filter design allows for up to 100,000 miles between filter services under normal highway driving conditions. A custom heat shield protects intake air from high engine bay temperatures, and the factory fresh air duct attaches to the heat shield. The entire system can typically be installed in 90 minutes or less.


Before Ordering

〇Regarding Import Consumption Tax
At Shaft-ya Shopping Site, we cover the import consumption tax incurred at the time of import on your behalf, so there are no additional charges beyond the total amount paid at checkout.

〇Compatibility Check
Our entire product database is based on North American vehicles (USDM). Please confirm whether the product can be installed on a Japanese model (JDM) vehicle before placing your order. (If you are unsure if a listed product fits your vehicle, please feel free to contact us. Our support team will be happy to look into it for you.)
If you place an order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if products are sorted by selecting the year, manufacturer, and vehicle model using the tabs on our top page, this does not necessarily mean they will fit Japanese model vehicles without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us if you have any questions before placing your order.

○Regarding Shipping
Shipping costs are paid at the time of payment. Shipping estimates are automatically calculated on the checkout page once you enter your shipping address. For large items such as body parts, there may occasionally be a significant discrepancy between the automatically calculated shipping cost and the actual shipping cost. In such cases, we will contact you individually via email.

Essentially, all products are shipped internationally from our US warehouse. Unlike domestic shipping in Japan, international delivery takes approximately 7 to 14 days, so please allow plenty of time for your order. If you are in a hurry, please contact us in advance to check the delivery date. Please note that all products are transported by air; they are not shipped by sea freight.

○Regarding Compliance with Japanese Vehicle Inspections
All products we handle are designed and manufactured outside of Japan. Please understand that they are not compliant with the "Japanese vehicle inspection system," and we cannot provide documents such as strength evaluation reports for Japanese vehicle inspections. Therefore, all parts are sold for "circuit, private property, or off-road use only," and installation and use are at your own risk.

○Regarding Warranty
Please check the contents immediately upon arrival. As all products are shipped internationally from outside Japan, there may be damage to the packaging or the product due to shipping. Please understand that we will only provide returns, refunds, or replacement products if you contact us within 7 days of receipt regarding products with shipping damage, defective items, or items different from your order. Additionally, for products sold through us, warranty support will be handled "exclusively through us." Please note that we do not provide support through other companies or distributors located within Japan.