It is probably better to figure out how you are going to lock the smoke unit in place before you start cutting an modifying the smoke funnel you just bought. If the one you bought doesn't work, buy one that does, or make one. The fact that is too large is easier to get to work then one that is too small. After rereading how can the funnel be too wide to span the stack bosses. If it where too narrow that would not work. How you fix the smoke unit in place comes first, then size the funnel or modify the shell to seal the funnel. G
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