I had a Moki 1.80 that flew great in a Pitts Biplane. Had a mate at the club that flew a 1/5 Pica with a 1.80 so I ran out and bought one but with a more powerful 2.10 (this one).
I had a massive stroke so it's all gotta go now. My loss is your gain. Ask me any questions that you have and I will try to answer.
The radial mount makes mounting on any plane easy and fast. The standard back plate is included just in case you want to use a standard mount.
Because of the stroke I can't remember who built the custom exhaust - sorry.