I have three of these engines, two .20's and a .28, they do not need muffler pressure. I added a pressure nipple to one of the .20s and it did not improve the handling of the engine one bit. Just keep the fuel tank as close to the engine as possible and try to keep the center line of the tank at the level of the needle valve. None of mine have the remote mounted needle valve so I can't comment on that.......... RJ