This idea might have some merit- have a small SS tube, about 1/4" dia welded
into the last 4 inches or so of the exhaust system, post muffler. The tube
would go in and take a sharp downstream turn. This should draw some vacuum.
How much, I don't know, but there are NO moving parts to break, and the
weight would be very small.
Brian Trubee

 
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