So your car's puny stereo isn't living up to its neighbourhood-shaking potential? Just add a subwoofer. You'll also need a box to mount it in, which can, of course, be bought, but why not build one?

Reader Ryan Mottau built this awesome DIY smartphone car mount using our favorite DIY wonder-tool, the binder clip. Here's how he did it. Problem: I wanted to take full advantage of the mapping ...