I used the Tru Air Mini pumper for 3 seasons on dirt, with a G-Force Air helmet
Had issues with the wires entering the pumper from connecting and disconnecting.
Problem solved when changing to a Kirkey full containment seat in my sprint.
Plain and simple, we couldn't use it. Interfeared with the head supports.
Once you race with an air helmet, it is tough to not to afterwards.
When we are up and racing again in '09, my new helmet will be with the top air port design so it will work with a full containment seat
Majority of racers around here with the air unit you have a link to have been mounting it behind the seat head rest.
When mounting it, think of fire. Definately mount the unit above the rear deck !
----- Gimpster -----