Wow, yours looks just like mine. My plane has the OS46SF engine and a Slimline Pitts style muffler. I broke in the engine with a coulpe of 10 oz tanks on the stock muffler. It runs very good with the pitts muffler with one of the exhaust tubes plugged.

I also installed the nose wheel strut cover and wheel pant but I don't know how long it is going to last on my grass field. I took it out for some high speed taxi runs and the nose wheel was "working" pretty hard[:-]. Just waiting for a good day to do the maiden.