When it comes to pump-gas performance, the name of the game is usually compromise. Unfortunately for turbo LS (or other) enthusiasts, real street (and some track) cars walk that fine line between ...

So what do you do when you've built your motor, strapped on the biggest turbo you can tolerate and basically tuned your forced-induction car to the teeth-but you still want more power? More boost ...

I know of a Toyota Vitz and a Subaru Forester that are equipped with water-methanol injection kits. Could you explain how these kits work, how they can be installed, and how much they might cost?