Fits the following vehicles:
- 1989 - 1997 Mazda Miata/MX-5 (NA)
- 1998 - 2005 Mazda Miata/MX-5 (NB)
About Thermalnator Thermal Intake Gaskets
Thermalnator is a unique high-temperature shielding gasket that replaces the stock intake manifold gasket. The cooling properties of the Thermalnator reduce heat by stopping metal-to-metal contact between the intake manifold and the engine block. Using a Thermalnator gasket reduces the heat of the air entering the engine, resulting in a power increase of up to 5%.
The Thermalnator gasket allows your intake manifold to act like an intercooler. Because the manifold is no longer being heated by the cylinder head, heat from the incoming air is dissipated through the aluminum very rapidly. The basic formula is that for every 5°F increase in intake air temperature, air density decreases by 1%. Higher air density results in more horsepower.
Average testing shows a 25°F drop, with some applications seeing a drop of up to 35°F. This is why the Thermalnator gasket is an excellent upgrade for both stock and modified vehicles.
Before Ordering
〇 About Import Consumption Tax
At the Shaftoya shopping site, we pay 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 vehicles (USDM), so please verify compatibility with Japanese vehicles (JDM) before placing your order. (Please feel free to contact us if you are unsure if a listed product will fit your vehicle. 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 fitment issues.
Please note that even if products are sorted by selecting the year, manufacturer, and vehicle model via the tabs on our top page, this does not necessarily guarantee that 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 Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are calculated automatically when you enter your shipping address on the checkout page. For large items such as body parts, there may occasionally be a significant discrepancy between the automatically calculated shipping amount and the actual cost. In such cases, we will contact you individually via email.
Basically, all products are shipped internationally from our US warehouse. Unlike domestic shipping in Japan, international shipping takes about 7 to 14 days, so please allow sufficient time when ordering. If you are in a hurry, please contact us in advance to confirm delivery times. Note that all items are shipped via air freight; they are not shipped 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 the "Japanese vehicle inspection system," and we are unable to provide strength inspection reports or similar documentation for Japanese vehicle inspection purposes. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and installation and use are at your own risk.
○ Regarding Warranties
Please check the contents of your order immediately upon arrival. As all products are shipped internationally from outside Japan, there is a possibility of shipping damage to the packaging or the product itself. Please understand that we will only provide returns, refunds, or replacements for items with shipping damage, defective products, or incorrect items if you contact us within 7 days of receipt. Furthermore, for products sold through us, all warranty-related support will be handled "exclusively through us." Please note that we do not provide support through other companies or distributors located within Japan.