Well I almost had the exhaust problem solved. I had an adapter plate made that gave extra clearance between the throttle push rod and the motor mount. After bolting every thing up I found out the exhaust pipes were too close to the nose wheel pant and would require a large cut out in the bottom of the cowl.

I decided to have a muffler made with the exhaust exiting at 70 degrees from center. I am trying to set up the exhaust to exit the model like the full size plane. I hope this works out.