Tuning at the car's resonant freqency will get you more output at that frequency; the port decreases the excursion of the driver, while still putting out the same spl. That means that you can push the driver to the limits of its excursion, and get insane spl. On top of that, add in the gain from the car (the whole car resonates), increasing the spl once again, and you have a competition vehicle. The resonant frequency of cars is somewhere around 50-60 Hz, so tuning above will get you no bass.
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