Hypothetical, I'm a fighter equipped with a cuirras and a tower shield.
Both have a max dexterity bonus of 2.
I take the following feat, [Armour Expertise II: When wearing armour, you receive a bonus of +1 to the Armour Class and a bonus of +2 to the Maximum Dexterity Bonus. Requires: Armour Expertise I, Level 12. ]
Do I now have a max dexterity bonus of 4?
Or would it still be 2 because due to the tower shield not being included in the feat.