Wondering if I can get opinions on the legality of this Miata coolant re-route kit:
http://www.etdracing.com/m-tuned/pro...products_id=86

Basically the kit caps the existing thermostat housing (which would be allowed as thermostat modification/removal?), replaces the rear coolant temp sensor housing (which also holds the heater hose fitting) with one that fits both the heater hose and a hose to the radiator (replacing the hose from where the original thermostat was). Would the replacement housing be allowed as an added "heater water control valve" (maybe if I added a check valve in it)?