Paul, I had an idea for an update to the VAM. Since
it appears to draw well once the power is up, all that
is needed is a way to prevent backflow at idle. A
simple reed valve would do the trick. This could be
built into the front of the pipe easily. The Kawasaki
street bikes used a stainless steel reed valve to put
air into the exhaust for smog control. That would work
for our purposes and tolerate the heat.
Bill Jepson

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