I have it refined a bit more here. I decided to move the motor mounts
even further out to reduce the rubber compression due to torque, improve the
vibration isolation and to give more room for the muffler or turbo along
side the engine. If I am going to have to pay over $1000 for an Inconel
muffler I might as well run the stock 89-92 cast iron exhaust manifold and
turbo and have good power up high to 14,000 feet or so. I am sure Mazda
checked the turbo on Pikes Peak for over speed.

This sketch also shows the mini PT6 type exhaust pipe coming right out of the
side of the cowling up near the front. The short unrestricted exhaust
pipe will give even more boost with the stock turbo.

Paul Lamar

Paul, this design looks good, but I think you may be underestimating the noise output.  Even with the turbine breaking up the noise it is still going to be very loud with no muffler.  At the very least you will want to angle it away from the cockpit.  Mike Wills exhaust looks impossibly loud to me too.  There is something about a rotary, the nature of the noise makes it seem even louder than it actually is, and it is pretty loud, louder than a piston engine for sure.

Hans Conser

Have you hear a North American AT6 take off? A Cessna 210 or 410 for that matter? 
Now that is LOUD! :-) We shall see. If it is too load I will take further
measures. I think what you hear are supersonic shock waves due to the rapidity 
of the exhaust port opening. If you don't run it at 8000 to 9000 RPM typical
of racing cars it should be quieter at only 6000 RPM.

Paul Lamar
 
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