Paul.   Is the casting for a RX8 thermostat diecast or cast aluminium??.
  Just worried that it may be diecast and unweldable.

 Neil.

I don't think that is the case. The rotor housings are diecast
and people weld on them all the timel.

I am sure the RX8 water pump and thermostat housings are
diecast.

In theory it is better to control the air supply to the heat exchangers
as that lowers the cooling drag.  Dr. Porsche knew that when he
designed the old air cooled VW :)

Those louvres under your rad should work fine to control the
engine temperature as long as they don't leak too much.
Same as cowl flaps on air cooled engines.

Paul Lamar

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