Diffusers work in conjunction with
To guide the high-speed airflow coming from under the car, the diffuser redirects the high-speed airflow to transition smoothly into the low-pressure vacuum at the rear. This allows the airflow under the car to become smoother, increasing the performance of other aerodynamic components such as aerodynamic wings.
Before Ordering
〇 Regarding Import Duties
At the Shaftoya shopping site, we pay the import duties incurred upon import on your behalf, so there will be no additional charges beyond the total amount paid at checkout.
〇Compatibility Check
All product databases are based on North American vehicles (USDM). Please confirm whether parts can be installed on Japanese vehicles (JDM) before ordering. (If you are unsure if the listed product is compatible with your vehicle, please feel free to contact us. Our support team will be happy to check 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 before ordering if you have any questions.
○ Regarding Delivery
Shipping costs are paid at the time of checkout. Estimates for shipping costs are calculated automatically once you enter your shipping address on the checkout page. For large items such as body parts, the actual shipping cost may occasionally differ significantly from the amount calculated automatically. In such cases, we will contact you individually via email.
In principle, all products are shipped internationally from our U.S. warehouse. Unlike domestic shipping in Japan, international shipping takes about 7 to 14 days, so please allow yourself enough time when ordering. If you are in a hurry, please contact us in advance to check delivery times. Note that all products are transported by air freight; they are not shipped by sea.
○ Regarding Japanese Vehicle Inspection Compatibility
The products we handle are basically all designed and manufactured outside of Japan. Please be aware that they are not compliant with the "Japanese Vehicle Inspection System," and we cannot provide documents such as strength calculation reports for the Japanese inspection system. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off public roads," and installation and use are at your own risk.
○ Regarding Warranty
Please check the contents immediately upon arrival. Since all products are shipped internationally from outside Japan, packaging boxes and products may sustain shipping damage. Please understand that we will only provide returns, refunds, or replacements for products with shipping damage, defective products, or incorrect items if you contact us within 7 days of receipt. Furthermore, for products sold through us, we will only handle warranty-related matters "directly through us." Please note that we do not handle matters through other companies or distributors located in Japan.