Hey guys let me tell you my ordeal and see what you guys think, either I messed up or I am looking in the right direction,, ok here is it,, I have a full stock(no carbon fiber parts,) extra special with a ZDZ60 pitts smoke muffler, it came in ready to fly at 20 lbs on the dot, well when doing hard core 3d etc, it has some bad charateristics sometimes, by that I mean trys to tip stall in places or attitudes I think it shouldn't if that makes since,, it just acts heavy like wing loading is to high?????? in harriers it rocks badly,, just things like that ,,, my rationing is if I sold the ZDZ60 with the heavy bisson pitts muffler,,, i could buy a DA50 with the light stock muffler save weight on the engine and muffler,, and then go and buy carbon gear, wing tube, tailwheel assembly,,, I would guess that even though I might lose a little power to the ZDZ I would gain overall better flight characteristics with the DA and carbon parts,, in other words 3d better,, I would love to get the plane down from 20 pounds to about 17ish, I think that will be close if I do these mods I am speaking of,, let me know what you guys think,,,