The filter will be used to protect the engine, the engineering has been worked out and parts identified to pull the whole idea off. The primary use of this is to feed cold air to the engine, the interior air option is a fall back position. If for some unknown reason the engine feed does not pan out, the plenum will be used provide outside air to the interior.
I really wanted to avoid having this beautiful scoop in the roof serve no practical purpose...that kind of stuff just says "k.t c.r" to me.
How did you come to select the Manex?