Max, I got it from a place called Aircraft Exhaust Inc. up in Minnesota. However, the ph # & email I have on my invoice from them do not work anymore, so I think they may have either gone OOB or moved. Sorry I can't help anymore than that, but I'm sure you can get one made up from one of the many exhaust vendors who advertise in Trade-a-Plane.
Looks like you are just getting started. Feel free to call or email me if I can help during your build. It's well worth all the trials & tribulation once you get it flying.
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