RE: DA-50 noise restrictions?
I have been around the Da50 with the stock muffler and there is no way it pass db unless the engine is over proped to it produces no rpm.
I was running the slimline pitts with a bolly 22-8 and it was loud. I switched to the KS 1060 pipe and a Bolly 23-8 prop and it is better but it still is not quiet. But it is good enough.