I've only ever headr Kicker Comps in a prefab ported box not best suited for them. But I have heard an older version of the Infinity reference, in a proper sealed box, and the were pretty darn loud, and sounded good going it. I'm hoping in an ideal ported box, and the fact that the car is a hatch, that they will be plenty loud. Especially considering most people she knows has a Dual or Sony in some prefab box off some over-rated amp.