Aluminum Thermostat Housing Flange fits all S5 FC Mazda RX-7 13B water pump housings. Designed for applications where the OEM housing needs to be eliminated due to space restrictions (Large turbos, 20B swaps, V-Mount installs, etc.)

Laser cut 3/8" Aluminum with 1.5" Dia. center to accommodate 1.5" OD pipe.

S5 FC Thermostat Housing Flange

 

Can you produce one of these for the S4?

 

Maybe, we will see how the S5 one does first.