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Shattering Sub-Woofer. I've never really understood the people that soup up their cars to produce sounds louder than the next guy. Some of these things are actually nearing sounds that are dangerous to humans.

But hey - maybe they'll take care of each other so that I don't have to worry about them. In the meantime, they supply a myth for us. Can all that sound actually destroy a car? I'm not talking about just blowing out a windshield, but actually destroying the whole car.

Adam and Jamie aim to find out in this myth. First they ship Tory off to Florida where he checks out some of the cars in one of the aforementioned contests.

As it turns out, while plenty of windshields have been done in and lots of vehicles have extra weight to hold in the pressure, no one there has ever heard of an entire car being destroyed by the pressure of a speaker.

So while Tory is on his trip, Adam and Jamie set about building a massive woofer to fill up a car. They take out the interior of an old Mercedes and turn the drive shaft into a crank shaft that will power the speaker. Then they bring in a sound pressure expert from Tory's trip and ask him to monitor things to see what happens.

While the woofer builds a truly impressive 161 decibels at 16 hertz, all it does is pop the sunroof out of its tracks - no destruction to be had, and this is much more than a standard stereo, so if it couldn't do it, it's doubtful that anything else could. Busted.

Rough Road Driving. Grant and Tory are testing out a myth from Down Under - that if you drive quickly over rough road conditions, you'll actually have a smoother ride. They rig up multiple monitors: Tory hooks one to the suspension, Grant hooks one in that he can download to his computer and Kari contributes an elegant waterfall pyramid model that doesn't require any of that fancy stuff.

Unfortunately the first result is inconclusive, so they head back to the drawing board and find out that they should probably try a washboard road, such as those found in Australia - that's the kind that was asked about most frequently. It's off to the abandoned runway, where they weld a temporary road together, and there the results are somewhat surprising. It seems that on this sort of road, the faster you drive, the smoother your ride. Confirmed.