I bought my 78 CB550 with this 4 into 1 exhaust. I like the look of this shorter pipe but it doesn't have a baffle in it so it's pretty loud. If I could find a baffle for it could I cut the baffle if needed, drill a hole in the pipe to secure the baffle, etc?
Something we used to do years ago..which works fairly well..is relatively easy to install..but probably illegal if stopped by police is:
Find perforated sink drain grate (as used in shower drains et al.) that approximates the inner diameter of the pipe/megaphone you want to install in. Then get brass rod of approximately 1/4 " diameter..drill hole in rod section in middle to accommodate a screw to hold sink grate to it. Drill two holes..top and bottom in the megaphone/pipe to accommodate the rod. Insert rod and grate into the megaphone and screw together to hold in megaphone.
If you position the grate properly you can rotate the grate either parallel or perpendicular to the pipe-megaphone..to be either open or closed (baffled).
Works pretty well. Not as quiet as regular baffle or muffler..but considerably quieter than open pipe. We used to do this for off-road versus street use. Only drawback is the two holes in megaphone to install baffle. And again..is probably not strictly legal. But with all the open pipes seen today (especially with the V-twin cruiser crowd)..it's noticeably quieter than that.
Ichi