Quote:
Originally Posted by stevej37
I like the sound a lot...I wish I could have that done to mine. Mine is a twin cyl..might be tougher to fit it somewheres and still have the hood tilt.
Flapper valve?....Never heard it called that. Always 'rain cap' around here. 
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Thanks :-)
You could make a dual "header" from the two cylinders to a 2-in-1 collector that welds to a V-clamp. Should be simple On the other end of the V-clamp the muffler attach. Or make it dual outlet :-)
I would also call it a rain cap, but googled it, and it seems to called an exhaust flapper what I could tell. So flapper it was, but just added rain cap in the title of youtube based on your comment :-)