Miata's engine has problem with 4th cylinder heating, it gets less cooling than other 3. To solve this problem you can install coolant reroute kit.
F4 Fabrication coolant reroute adapder is the best sollution to prevent overheating.
Kit includes:
CAD designed and CNC machined aluminium adapter
Nozzle for heater hose
Adapter for coolant temperature sensor
EGR blind cover for exhaust manifold
EGR blind cover for intake manifold
Laser cut blind covers for front coolant neck and engine head
Note: recommend to use RTV sealant
Note: Hose from water neck to radiator, thermostat and water neck is not included
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