Different types of power attack

[LoKhorne1288]

Do Power Attack, Barbarian Power Attack, and Warforged Power Attack stack?

[Rusty_Can]

Yes: WF barbarians, training all their racial and class enhancements, can achieve +11 bonus to damage (+22 using two-handed weapons) and -11 penalty to hit.

[Angelus_dead]

There is an error with Barb/WF Power Attack where the icons make them look like they can be toggles separately from Power Attack, but really they automatically modify it permanently.