Jerry,

This incorporates Butch's idea. 

First one is peeking around the firewall from the left
side. As you can see there is plenty of clearance.
Also clears the cowl by about 2 inches.

If this does not work out a tuned tang muff will also fit.

BTW How would  you like to start on the dyno?
You could test some muffler ideas for both HP AND sound.

Paul Lamar
 
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