When Peppers is pissed off at a team there is no stopping him from getting pressure... you can slow his pressure down but you can't stop it.
That being said there are games where he looks like he wishes he was on a beach relaxing and isn't full mentally into the game.
But I fear Lovie Smith will go out of his way to make sure that doesn't happen against the Packers.
As for Allen he can be stopped.... make sure he doesn't bull rush you and never stop against him... the Cards heavy footed back-up power LT did well against Allen (at least in one game). I think Bulaga could handle Allen. With Allen it's more attack him...
I still one game where the Packers didn't even try to run up the middle the first half... just attacking the DE and outside of the DEs, and it worked well enough to get the win. Allen can't chase you down from behind as much if you pancake block him at the point of attack.