I think this is why you'd need to change it to a US version.. Obviously not for the more intelligent Americans, but from what I've heard, many can't detect the sarcasm used in TG.
For example, some of the comments on this video from US people.
http://youtube.com/watch?v=ekpD06P7kiI
I'm not saying that the populous is less intelligent. However, our culture is geared towards the wit involved in Top Gear, whereas I imagine that many of the American people need more obvious humour, for it to be deemed a success. Am I right in this assumption?
Do many UK shows go to the US?
I can't think of many that I really watch which are English in terms of a drama series, since the majority are now American..
Major series that are running in the UK:
24
Prison Break
Dirty Sexy Money
House MD
Scrubs
I can't really think of any English equivalents, and any that there are, get copied and Americanised, instead of replayed, such as American Office and Big Brother USA (not that BB has any intrinsic value).
Basically TG is purely English and I love it