Cooling

I've done that too in my Alon, but I do find the airspeed to be slightly reduced.

I don't know of a kit, but I saw a really cool idea somewhere - take a large fan (8-12 inches) that can be run with airflow either way and mount it on the panel leading to the empennage. Recently, my empennage cover screws came loose and I was getting HUGE amounts of cool air dumped on my back, neck, and shoulders.