Roaring engines are standard fare at a stock car race. What’s the history behind the horsepower and what are the rules now?

If you've ever driven a car into water that was deeper than you expected, you might have suffered the consequences of a submerged engine. While getting a car engine wet is no big deal, getting water ...

Let's face it, most engine additives don't really improve performances. If you want to try one that does, here's what you should pick.