It's a magnum 91 rfs and a GP or hayes mount - can't recall. I think I got the thrust line correct but I didn't have to go all the way to the top as Mike mentioned. We'll see, if I'm off it's only an 1/8" to 3/16" or so - I can adjust that with up or down thrust...I hope...

No, I didn't have to recess it to get it in there that is just a peice of light ply covering the hole left from that box that is originally there for the standard muffler. And, yes removing that box does remove some cooling but I don't think it will be a problem. The cowl has a nice intake for fresh air - I just have to make an equally nice outlet for that air out the bottom of the cowl. Like I said - I don't think it's going to be a problem as I've had this configuration before in other airplanes. We'll see though I'm sure.

So far it looks like rain all day tomorrow on my end. That means the best I can expect is next weekend.