ISR low-temperature thermostat for KA24DE and SR20DET. A suitable upgrade for high-performance engines, the ISR unit opens at 60 degrees Celsius compared to the factory 76.5 degrees. Cool your motor before heat builds up.
Once the engine is fully warmed up, the ISR thermostat opens at a lower temperature than the standard thermostat, allowing coolant to flow. The engine operates sooner, engine temperature drops, and a lower temperature is maintained.
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Legal only for use in competition vehicles that are not registered or licensed and cannot be used on public roads or highways. It may also be used on other exempt 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 will be no additional charges other than the total amount paid at checkout.
〇 Checking Compatibility
Since all product databases are based on North American vehicles (USDM), please confirm whether they 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 check for you.)
If you order without verifying compatibility, we cannot accept returns due to incompatibility.
Please note that even if products are sorted by selecting the year, manufacturer, and vehicle model in the tabs on our top page, it 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 Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are calculated automatically once 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 cost and the actual shipping cost. In such cases, we will contact you individually via email.
Basically, all products are shipped internationally from our US warehouse. Unlike domestic shipping within Japan, international shipping takes about 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 confirm the delivery date. All products are transported by air; they are never shipped by sea freight.
○ Regarding Compliance with Japanese Vehicle Inspection (Shaken)
All products we handle are fundamentally designed and manufactured outside of Japan. Please note that they are not compliant with the "Japanese Vehicle Inspection System," and we cannot provide strength study reports or similar documentation for the Japanese inspection system. Therefore, all parts are sold for the purpose of "use on circuits, private land, or off-road," 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, there may be shipping damage to the packing boxes or the products themselves. Please understand that we will only provide returns, refunds, or replacement items for products with shipping damage, defective products, or incorrect items if notified within 7 days of receipt. Please note that for products sold through us, warranty support will be provided "only through us." We do not provide support through other companies or distributors located in Japan.