"Top Gear" doesn't do understatement. If it were a car, the BBC's hit auto show would be a flashy, precision-tooled racer. Co-host Chris Evans calls it "a car-show nuclear bomb" -- and it returns to the screen facing the fallout of former host Jeremy Clarkson's explosive exit. In the new-look "Top Gear" -- premiering Sunday in Britain and Monday on BBC America -- main presenters LeBlanc and Evans are joined by German driver Sabine Schmitz, former motorsport boss Eddie Jordan, automotive journalists Chris Harris and Rory Reid and anonymous, helmeted driver The Stig. Evans, a veteran British TV and radio host, says the format has been tweaked, but the essence of the program remains. He say fans -- he counts himself among them -- "don't want us to reinvent the wheel."