The Spell Perfection feat:
Pick one spell which you have the ability to cast. Whenever you cast that spell you may apply any one metamagic feat you have to that spell without affecting its level or casting time, as long as the total modified level of the spell does not use a spell slot above 9th level. In addition, [...]
If applying the metamagic feat doesn't modify the spell's level, why is it saying the modified level can't be higher than 9? I presume that actually means: The modified level plus the modifier of the metamagic feat being applied can't be higher than 9.