But whatever the reason, it's a bit of a shame, because the cars can be wicked cool. Like the new Audi A5 DTM. Touring car racing isn't big in the States, which could be in part due to the ...

But don't think for one minute that returning manufacturers Audi and Mercedes-Benz are about to let their Bavarian rival simply waltz in unchallenged. But while the existing DTM drivetrain ...