Jerry Bass wrote:

Now what should I do?

If Ed has a different Pipe with the same fittings, I can use the out pipe.  
I lengentend the block to VAM by about 4 inches.

If we need to muffle the VAM pipe, it will also cause back pressure.

Jerry Bass
540-241-2675, cell

Just stop right there Jerry and send me the VAM.  Best to use a conventional
 tangential muffler. Ed will build you one. Make a sketch or wait until
I get the VAM back and I will make a drawing of a conventional tangential muffler
that will be safe and fit your airplane.

Paul Lamar
 
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