How about stripping the chrome and going stealth? :tounge
Sorry, couldn't resist since I'm busy buying chrome to make my '09 FLHR look more like the Screaming Eagle.
If you want more chrome, look at the Kuryakyn turn neck covers. That will dress up a part of the bike often overlooked. And, while they are not particulary noticeable, LED front and rear turn signal lights and a run-turn-brake controller are a good safety investment. Perhaps Lizard Lights if you like that sort of thing.
Just peruse catalogs and go to bike meets. That's a good way to get ideas. I took my wife to a bike meet this weekend and it's already added to the Harley tax! :newsmile093:
<edit> Ooops! Just re-read the original post and realized this post is totally irrelevant. Well, on the engine front, how about talking to Boss Hog about a V8 for it?