AEM's Water/Methanol Injection systems are compatible with forced induction (turbocharged or supercharged) gasoline and turbo-diesel vehicles. They effectively reduce intake air temperatures and improve combustion efficiency, which suppresses harmful detonation (knocking). This allows for reliable boost increases and ignition timing advancement, enabling you to extract more power with less stress on the engine. AEM's water/methanol injection kits feature robust hardware and offer more advanced functions compared to other systems in the same price range.
Before You Order
〇 Regarding Import Consumption Tax
At the Shaftoya 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Checking Compatibility
Our entire product database is based on North American market vehicles (USDM), so please verify compatibility with Japanese market vehicles (JDM) before placing your order. (If you are unsure whether 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, make, and model using the tabs on our top page, this does not necessarily guarantee a direct fit for Japanese market vehicles without modification.
All product descriptions have been translated into Japanese using translation software. As there may be ambiguous phrasing, please contact us if you have any questions before ordering.
○ Regarding Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are calculated automatically once you enter your delivery address on the checkout page. For large items such as body parts, there are rare cases where there may be a significant discrepancy between the automatically calculated shipping cost and the actual cost. In such cases, we will contact you individually via email.
Basically, all products are shipped internationally from our U.S. warehouse. Unlike domestic shipping in Japan, international shipping takes approximately 7 to 14 days, so please allow sufficient time when placing your order. If you are in a hurry, please contact us in advance to confirm delivery times. Please note that all products are transported by air; we do not ship via sea freight.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
Please be aware that all products we handle are designed and manufactured outside of Japan. They are not compliant with Japan's "Shaken" inspection system, and we are unable to provide strength calculation reports or similar documentation for Japanese inspection purposes. Therefore, all parts are sold for use on circuits, private property, or off-road use only, and installation and usage are at your own risk.
○ Regarding Warranty
Please check the contents of your order as soon as it arrives. Since all products are shipped internationally from outside Japan, there may be instances of shipping damage to the packaging or the product itself. Please understand that we will only provide returns, refunds, or exchanges for shipping damage, defective products, or incorrect items if notified within 7 days of receipt. Furthermore, regarding products sold through us, all warranty-related support will be handled "exclusively through our company." Please note that we do not facilitate support through other companies or distributors located within Japan.