I heard of some hobby shops repitching dynamax/ramtec fans.. but its not nessacery.. just get a jet or kit.. if it requires a .46+ put a os.91 in it if it requires .77-.99 put a os.91 in it always go with the most power you can fit into the jet of your choose.. Ive found its not fun to fly a DF jet that needs all its possible power just to takeoff... underpowered jets are not fun to fly, and your chance of messing up&stalling are greater.. thanks my .50 cents for ya...