Apparently there is an American version of Top Gear premiering on TV right this minute.
I think this is a worthwhile idea, but I am very skeptical of it working well since I think so much of the success of the British show revolves around the appeal of hosts Jeremy Clarkson, Richard Hammond and James May. (Mostly Clarkson.)
I've listened to every single episode of Car Talk for the last six (seven?) years. That's because Tom and Ray Magliozzi are that charming, not because I particularly care about cars. I think Top Gear has the same appeal.
Speaking of which, the American Top Gear ought to have Tom & Ray make guest appearances once in a while. That would just be worlds colliding in the best possible way. Are you listening, producers?