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All that the ohmage does is increase the power rating. Lower ohms higher power from the same power supply voltage. Even 8 ohms in a car should have enough volume for normal listening.
The sensitivity is related to 2 factors. Gap between coils and magnets. Speaker weight. Smaller gap, higher sensivity, lighter cone, easier to move. The problem with cars is that when you bang the doors closed, the cone gets a massive pressure pulse and so car speakers are made heavier than hi fi ones to be able to take the abuse. So to start they are less sensitive.
Bottom line driving down the highway, you wont hear the difference.
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