not enough pressure can burn valves on a small enginge being run for long periods of time worse than too much which just chokes off the flow of air through the mill. All internal combustion engines are, is just air pumps, so they work best when they move the most air (within reason). Brigs engines are easy to quiet down with different mufflers but take a bit of welding to make the adaptors to make... They use basic pipe threads to mount the mufflers so all you really need to do is find a small car muffler and make a mount for it to fit on the Gennies frame, make a heat shield for it and the pipe you need to route up to the exhaust outlet of the motor and mount it up. the trick is to transition to about 1 7/8'' exhaust pipe asap out of the motor. A muffler from a SMALL 4 cyl car or even any multi cylinder motor such as a quiet cycle should take care of the rest better than an actual small engine muffler, as small engine mufflers are really just spark arrestors.
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