Life time Warranty
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  • Direct fit for the 1999-2005 Mazda Miata NB
  • Lower activation temperature allows coolant to flow through the engine earlier, maintaining lower temperatures (Mishimoto thermostat activates at 177F vs. stock 195F)
  • Mishimoto Lifetime Warranty


The Mishimoto racing thermostat for the 99-05 Mazda Miata NB will promote greater cooling efficiency in your stock or modified Miata. Once the engine is fully warmed up, Mishimoto's Miata NB racing thermostat will open at a lower temperature than standard thermostats. This allows coolant to flow through the engine sooner, which reduces and maintains cooler engine temperatures. The Mishimoto 99-05 Miata NB racing thermostat is the perfect addition to your street or track Miata and is a direct replacement for the stock thermostat. This thermostat includes the signature Mishimoto Lifetime Warranty.

Purchase Includes

(1) Mishimoto Thermostat
Mishimoto Lifetime Warranty
More Information
Applications1999-2005 Mazda Miata
1995-2003 Mazda Protégé 1.5L, 1.6L, 1.8L
2004-2005 Mazda Miata MazdaSpeed
Engine CodesBP-4W I4
BP-Z3 I4
Chassis CodesNB8C
Mishimoto Activation Temperature (F)177
OEM Activation Temperature (F)195

Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.

For our complete warranty policy, please click here.