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You could fake the slit.
Make the END of the pipe have the slit and then put some larger concealed holes on the bottom of the pipe where the majority of the exhaust would actually exit the pipe. Can't see any downside to this approach.
If you lived in a colder climate, however, it may look kinda gay when the exhaust steam was leaving the BOTTOM of the pipe instead of the end.
Just an idea.
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