I've only had excitements of about 9 or below, but I know someone who got a decent excitement and then went berserk with theming and raised it into the 11's. I bet any coaster can go up a few points in excitement if you spend lots of $$ theming and landscaping it.
As for intensity, about 27. Steel corkscrew with max drop (60 or 61) followed by a series of corkscrews. I have no idea how one would get above that, except maybe with a stand-up or another intensity-prone type.
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PLEASE READ: This post wasn't meant to offend or anger anyone; I apologize in advance if it does. So please don't post a reply just to rant about it. :)