Hi Greg, I ordered the prop through Vogelsang. SEP Germany makes the props and distributes through vogelsang in the U.S. Took about 6-8 weeks. regarding the exhaust, I know.... I was thinking about making them working, but at then just moved on. What I thought I needed was more air movement through the cowl.. so... I'm going to enclose the pipe area on each side and build air ducts through the fire wall to allow more air movement from the engine compartment and out the exhaust area.. for the actual exhaust I'll be using the flex pipes off the exhaust ring and have short down and out exhaust. At least the sound will be good.