while they do make an exhaust type of throttle it really does not work well,I have a dragonfly .049 on a champton eindecker and with the exhust almost fully closed idle is about 6000 rpm still to fast to land.still have to wait for it to run out of fuel.all you need to mount it would be to epoxy an 1/8" thick plywood firewall and some #2 sheet metal screws.