The 044 mufflers do not have baffles in them, and these are the old ones with the larger 5/8 hole already there. They like the dp covers also, but when I tried to open it up more than that the idle & throttle response suffered, and I was unable to adjust it out with the tune. So I put the modified dp cover on the 046, and it likes it!
I don't have the tools to port the cylinder.
I think I will live with the 33/1000 squish. W/O CR, I don't want to make it harder to start.
Adjusting the timing seems to make a nice difference on the 044. When the 046 was stock, it did not seem to make any difference. I think that is because the older 044 jugs are ported more aggressively from the factory, and the 046 needed to be ported to take advantage of the timing advance. That is my best guess.