Hi Ken, and thanks for the info.

Several of the flyers at our main field are Pattern. They are very much into noise (or lack thereof). They like things quiet. Their big objection with the larger aircraft is the noise level, playing the prop-swap to try to quiet them down a bit. I am not sure how the Pitts style muffler would be received by these guys.

With the Tiger 120, it's an open engine compartment with fuselage 'cheeks' on either side of the engine. I was thinking of mounting the engine sideways, punching a hole in the cheek for clearance, then running the exhaust out the bottom which would pretty much qualify the Pitts. I will have to look this over a bit more, though, before I finally decide. This build is not going to be a 'stock' arf build. I am making several other mods but most are internal.

Thanks again.

DS.