Had pretty good luck in the past just taking the chrome cap off the muffler and drilling about six 1/4 inch holes around the factory exit just in the shell of the muffler end , then putting the chrome cap back on to hide it. Now that was on chinese scooters and atvs but they all pretty much have the same muffler. Might start with one or 2 holes depending on how loud you are worried about it being, then going up from there.
You most likely find any commercial construction site and just ask the electrician for a 2 inch long piece of one inch EMT. You ask us for conduit most of the time we will give you IMC or rigid, while it'll work it's thick and overkill. We generally don't save anything under a few feet long anyways. If you weld on it make sure you sand the zinc off it first. We don't need anybody getting zinc poisoning on here. If you can't find any local hollar at me and I'll dig around and see what I can find but my scrap is drying up since going out on disability.
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