It muffles
ok, but not great. Its a step above a straight pipe, but a few steps below a muffler. What made me decide to make one, was when i made my shifter kart, but didnt want to straight pipe it because it didnt sound great, but the stock muffler was VERY restrictive (this was a 100cc 4 stroke and the muffler was like 4 feet long not including the header) so i made a little head and welded this thing on, made it sound pretty nice.
Ok here are some pics of the internals, sorry tim i dont actually have another empty can so i cant make a new one now. The welds on this suck, i know, i made it when i was just learning to weld.
Top of your average paint can, i just pried the valve part off with a screwdriver, it can be a ***** to get off, just take your time.
Heres the one i removed the valve part from, it has a nice strong flange to it.
And the bottom of the can, i just used a sheet rock knife and cut it out.
Heres the pipe assembly that i made to slide right in.
Its two pieces, one longer piece, that has a larger OD, i cut it off a bike frame. At the end i welded a slightly smaller OD pipe to it that fit snugly in the top of the paint can. The step up in pipe stops the pipe from sliding up.
About halfway down the larger pipe, i cut a chunk out of it.
Inside where i cut out, i welded a washer in on either side, and globbed it up so it was air tight.
On either side of the "plug" that i made (chunk cut out with washers welded in) i cut a lot of slits with a hacksaw, like the bevels in a car exhaust.
And thats about it. The can is very thin, and i cant weld it with my flux core wire. If you had some good .023 mig wire and gas, im sure you could carefully weld it.