NO ONE in the league has been able to cover these guys man-to-man. Not saying it is not possible, just saying it is not probable.
I'm not saying man to man, they will probably get burned, they can't hold that offense to 0 yards, but they might be able to contain them.
I don't think the Cards will run against the Steelers, so the Cards will have to pass, and the Steelers will be able to defend it pretty good.
If they knock down Warner constantly, or if they rush him enough to where he throws INTs. the Steelers will win.
If the Cards throw without any probloms, they will win, but I think the Steelers D will stop them better than anyone else has.
BTW...look for Heath Miller, the Steelers TE, he will have a big game.