Mel,

Sound level of the 33GT (piped, soft mounted, 2 blade 18x12 carbon-wood hybrid prop) is probably around 94-95 dB. It probably would pass the sound test. I have a 3 blader I am developing that should reduce the dB a bit... Final word not yet developed. The engine should have the guts to turn an 18x10 3 blader at useful rpm and good mid range response with this much load

Walbro is amazing for what it does but to me, needs either a mid range needle, a servo controlled low speed needle or both. Servo controlled low speed needle is not new of course and will tend to complicate things a bit but Pattern people want crisp response at any setting. That's one way to do it as my good friend Jersey Jim Martin has said time and again. That's straight forward implementation; not a difficult thing to do. I am not sure an OS developed purpose carb is a good thing unless cost could be controlled at a reasonable level. I am actually surprised their 33 is as cheap as it is

You are very welcome. We are in this together so we should help one another and learn from each other