I'm glad to see this too. Would you say using the walbro carb is worth the change or is stock carb good if one can adjust the needles?? Also on first post you are turning 18*6W on gas with more oil than needed 8450rpm with no pipe. 8040 on 18*8W with pipe and less oil so do you feel pipe is more power or pitts muffler about as good. I have 2 of OS160fx on planes and don't want to change exhausts or carb unless necessary(cowl unavailable for one plane). I also have 2 OS120AX and wonder if they would convert as well. I think the conversion would be worth it on engines already installed in planes as a lot of the cost of converting is offset by cost of new gas engineAND cowls,firewall changes etc THANKS,RACJ