Cooling System › By pass idle control#1(Thermostat Neck to idle air valve) NA6 Image 1 of 2 Image 2 of 2 By pass idle control#1(Thermostat Neck to idle air valve) NA6 $22.29 Genuine Mazda MX5 - New Part- one By pass idle control#1(Thermostat Nect to idle air valve) Quantity: Add To Cart Added! Genuine Mazda MX5 - New Part- one By pass idle control#1(Thermostat Nect to idle air valve) You may want to see this... Coolant Body Pipe - NA6 $70.00 By pass w/p inlet ( thermostat neck to w/p inlet) NB8 facelift 01-04 $46.29 Radiator and Heater Hose Kits for NA and NB MX5 from $177.33 By pass idle control#3 NB8 (Oil filter to rear of head) $27.25 By pass idle control#2 NB8 (Throttle body to intake(bottom)) $21.00