Only issue is the heat muff. And this is very disappointing issue.
Turns out on the M1B engine the heat muff can't go on the tail pipe of cylinder #3 which is how I planned it, and is where the hole in the rear baffle is suppose to connect thru Scat tube. Instead they want the muff on a straight part of #1 and with a inlet hole in the front ramp of the right air inlet. Well I don't want to cut another hole now in the inlet.
I will see what the forum has for ideas. Maybe somebody has an alternative.