Per the SRD:
Fire Affinity: Ifrit sorcerers with the elemental (fire) bloodline treat their Charisma score as 2 points higher for all sorcerer spells and class abilities...
When does that +2 charisma bonus come into play?
For instance: My Ifrit has a base Charisma of 17, which becomes 19 after I add two for the Ifrit Racial Ability Score Modifiers. That gives me a +4 Charisma Modifier (was +3 with 17 Charisma)
Do I consider my Charisma to be 21 when calculating the Charisma Modifier for Class Abilities? Making the Charisma Modifier for those Abilities +5?
Do I consider my Charisma to be 21 when calculating how many Bonus Spells Per Day I can cast?
Do I consider my Charisma Modifier to be 5 when calculating my base Spell DC (for sorcerer spells)?