Holy smokes, Downtown! That is one heck of a trike! Pretty sure it'd be way too much for me, though. I'd doubtless put it into the side of our neighbor's house when I first took off LOL
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Yep, I saw the same, slaw, but my local shop said it can be done. Out of curiosity, I went directly to HD and was told that, yes, it can be added to a trike BUT it invalidates the engine portion of your warranty since it was not designed with trikes in mind.
With that being said, I think I'll leave my girl's engine where it is and just tweak it with a Screamin' Eagle Stage I