Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
Upgrade your Mazda Miata NB with the Mishimoto 99-05 Racing Thermostat, designed to improve cooling performance both on the street and track. This thermostat features a lower activation temperature of 177°F compared to the stock 195°F, allowing coolant to flow through the engine sooner, which helps maintain cooler operating temperatures and reduces thermal stress. Its direct replacement design ensures an easy installation process, fitting seamlessly into your vehicle’s cooling system without modifications. The Mishimoto racing thermostat is ideal for enthusiasts looking to optimize engine temperature management during spirited driving or high-performance use. Constructed with quality materials, it offers durability and reliable operation, backed by Mishimoto’s lifetime warranty for peace of mind. Whether your Miata is stock or modified, this thermostat is a practical upgrade for achieving consistent cooling performance and enhanced engine longevity. It is compatible with a range of Mazda models including the 1999-2005 Mazda Miata NB, ensuring a perfect fit for your vehicle's cooling system.
Features:
Fitment:
1995 Mazda Protege DX
1995 Mazda Protege ES
1995 Mazda Protege LX
1999 Mazda Miata 10th Anniversary
1999 Mazda Miata Base
2000 Mazda Miata Base
2000 Mazda Miata LS
2000 Mazda Miata SE
2001 Mazda Miata Base
2001 Mazda Miata LS
2001 Mazda Miata SE
2002 Mazda Miata Base
2002 Mazda Miata LS
2002 Mazda Miata SE
2003 Mazda Miata Base
2003 Mazda Miata LS
2003 Mazda Miata SE
2003 Mazda Miata Shinsen
2004 Mazda Miata Base
2004 Mazda Miata LS
2004 Mazda Miata Mazdaspeed
2005 Mazda Miata Base
2005 Mazda Miata LS
2005 Mazda Miata Mazdaspeed
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
