Forward a few years I happened to be at a trade show where they actually had one of these contests, and sure enough, the SPL was loud enough to break the windshield of the car! What I didn't account for is that no one would be crazy to sit inside the car during the contest. Here's a cute little video that shows exactly what happens when the pedal goes to the metal with a souped-up car stereo.
Remember that this is absolutely nothing to do with audio quality; it's pure and simple audio level. One of the trademarks of clean SPL is that it doesn't sound loud, just bigger. Once you've heard a playback in that environment, it sticks with you forever.
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