I run an OS A3 plug. A 10x6 MasterAirscrew prop, and I use CoolPower fuel at 10%. It was a Dubro fuel filter, but I have removed all that stuff. After I get it flying good I might try the Exhaust deflector again. I really am lazy and the muffler points directly at the LE of the wing. I can just see the oil hitting that wing and getting spread over every where. I have the Dubro fuel system thing, that you put in the cap of your fuel jug. It has a fine wire mesh screen on the inlet. Is that good enough or should I use more. I could easly put a car filter in the line too. Won't the oil in the fuel clog up the car filter pretty quickly? Or do you need to empty it out everytime you fuel.