nice job - i like what you did -- what hp is that single cyl diesel?
for connecting the flex line, i used a sanitary clamp, and like you described, i run it into a spare car muffler i had - it's a loose fit as the flex is 2" and the muffler inlet is 3" but i slip it in about 9-10" and don't hear a thing but the engine's mechanical noise -
here's a couple shots - i had first wrapped the flex with asbestos tape for handling when hot and was hoping it might kill some of the noise resonating from the pipe - the tape did zero in that regard - it wasn't till i tried that muffler that all the combustion report noise became history
in the first shot, the flex pipe is off, stored where it stays when not in use - next to the fire extinquisher - you can see the sanitary clamp hanging off the flange i added to the honda's muffler. The sanitary clamp is actually something from the food industry but available from
McMaster-Carr, but it was 316 SS, so i figured it'd take the heat and it's handled it fine. but it's quick detach and that's why i went with it. I initially drilled the T handle lock nut for safety wire in case i found it coming loose - never has and last outage was 2+ days