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personally i've fancied removing the airbox, sticking some filters on and relocating the battery.
Here's what I found doing that on a standard Bonneville (the results ought to be quite similar on on of our models as well). I cut up the air box to turn it into a battery holder, a little easier on the standard since there are no cheese graters. I installed K&N pods and a home-made carb brace. I installed Emgo reverse cones for silencers. I upped the jets to suit, in this case 42 pilots and 145 mains; I'm quite sure a 270° engine would require 45 pilots. The end result was a much quicker throttle response and a slightly higher top speed; it felt like more power but getting to the power quicker might have made that an illusion.
I keep flip flopping about doing the same to my America, not because of any mechanical considerations but because I don't think the open engine look would suit my current semi-bagger look. That, and it's making pretty good power now with the stock airbox, K&N filter, homemade bellmouth, Thruxon needles and SS free flowing pipes.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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