John,

sure you want to do this?  
As far as I can tell, the most measurable effect of changing the exhaust stack configuration is the amount of soot on the bottom of the plane.
The second most measurable effect is the amount of noise in the plane.
Both of those will change your life more than 1/2 a knot will.
...that said, I'm no expert on this particular mod.

Colyn


On Aug 18, 2014, at 8:15 AM, John Barrett wrote:



<photo 1.JPG>Tape guide for cutting stacks along exhaust marks


<photo 2.JPG>Exhaust marks on stacks
M

Sent from my iPhone--
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