M-Tuned Radiator Coolant Reroute Kit 1.6L Mazda Miata MX5 for Sale

Price: $165

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M-Tuned Radiator Coolant Reroute Kit 1.6L Mazda Miata MX5 Click Thumbnails to Enlarge Product Description

Mazda Miata MX-5 M-Tuned Coolant Reroute Kit 1990-1993 1.6L

Why reroute?

The B series engine in the Miata was designed for a fwd car. As with all inline 4 cyl engines, coolant entered one one end of the head and exited the other end in the fwd application. This simple path is the most efficient way to extract heat from the head. Mazda turned the engine 90° and tucked it up against the firewall in the Miata. This meant moving the coolant exit to the front, the same end of the head as the inlet. This poor flow path is the primary cause for overheating which is so common in the 90-05 MX5. Our reroute has a carefully engineered low profile adapter for the back of the head to retain the original front to back coolant path. Just this one modification will significantly reduce coolant temps. Even a bone stock Miata will run a bit hot, and the stock ECU will reduce ignition timing which hurts power and fuel economy.


  • The Reroute Features Internally machined to maximize coolant velocity which is key to improving cooling efficiency.
  • Retain the use of your EGR pipe for emissions or CEL.
  • The OEM coolant temp sensor location is retained so the wiring harness does not need to be modified.
  • Spare 1/8 NPT ports are provided for aftermarket coolant temp or coolant pressure sensors.
  • All important hardware is stainless steel to increase service life.
  • High flow Stant Superstat is utilized to increase coolant velocity.
  • Simple sealed adapter housing elminates gaskets and finicky, leak prone threaded fittings.
  • Convenient bleed port allows system bleeding with car level if you have COPS ignition.
  • No remote thermostat housing for easy fitment and improved reliability.

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  • Orders must be placed by 12pm EST Monday - Friday to start processing on the same day. Processing time takes 1 business day.
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  • Orders placed on Saturday or Sunday will not be processed until the following Monday.
  • Hawaii, Alaska and Puerto Rico do not qualify for Free Shipping.
  • For shipments to Hawaii, Alaska, or Puerto Rico we offer USPS Priority, USPS Express, FedEx, and UPS 2 Day and 1 Day shipping services. Please inquire with us for shipping rates before placing your order.
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  • For unopened and unused merchandise we offer a 30 Day Money Back Return Policy (minus a standard 20% restocking fee).
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  • Buyer must contact HPTautosport before returning any merchandise. We reserve the right to refuse any returns received without authorization.
  • Fr items that have been opened or installed: only the manufacturer's warranty applies, no refund or return is allowed.
  • For items purchased in error or after 30 days, HPTautosport wil determine if the return will be allowed.
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