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I'm just starting my ground running phase, but I elected to use the turbo for a 'muffler'. I decided the weight would be offset by the power, somewhat.
I decided not to dump the down pipe out the left cowl cheek because the RV-8 fresh air intake for the pilot is right aft of the turbo.
Carbon monoxide is a real problem in aircraft, so I decided it was best to avoid having any engine compartment air or exhaust on the left side of the cockpit.
My exhaust downpipe comes straight aft off the turbo, turns 90 degrees and aims down to the lower cowl exit where it's directed aft at the angle of the exit ramp.
If I discover a problem with heat, I'll ad a 15 degree turn down. If too much noise, I have a stainless Hush Power that I could add, hanging like a bomb under my seat.
Running the engine on the ground, the noise level did not seem offensive, but the highest RPM so far was 3500, or just about half take off power.
My YouTube video shows the engine running (search flyrotary) taken about 20 feet away by my wife with a FUji F650 digital camera. I think it is acceptable.
Scott E
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