Are you talking about D Motor? I've never watched it because as an American I only speak American, dammit, but as I understand it it's a completely separate show done by a completely different company.
Which may be why it's OK.
Because their presenters know how to drive, as opposed to the American ones.
Honestly, that's not the problem with the US show. I mean, Captain Slow works.
No, the problem with the US show is that they removed the Power Laps, car reviews, "star in a reasonably priced car" and news segments, concentrating solely on the stunts. It just doesn't work because you get no sense of the personality of any of the presenters. You don't see them being "normal," you don't see any banter between them, you get no chemistry because they're always out driving cars and doing stupid things. It just doesn't work.
It also has the side-effect of making the "silent racing car driver" (apparently you can't call the Stig "tamed" in the US) a character that has absolutely no context when he shows up. Why is there suddenly a silent racing car driver driving a random car for them to race against? Oh, and now he's gone, never to show up for the remainder of the episode. Uh, OK, that was sure wacky!