Its a pretty dramatic increase from having the standard audio. My system lacked almost all low frequencies. If you have the Ultra High Fidelity upgrade, i still think it sounds better, giving deeper and louder bass when you want it. When I test drove and listened to the audio system in the demo cars before I ordered, i didn't feel the upgrade was worth the cost. The NVX enclosure is very well built and the Sub sound quality exceeded my expectations. $1000 delivered from Evanexx for the sub/enclosure, AudioControl LC2i, Amp and Wiring Kit was well worth it, in my opinion. If it sounded like this when I demoed, I definitely would have paid the upgrade cost.
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Everything still works as normal.