Power's M3 Touring upgrade boosts the S58 inline-six engine to 800 metric horses, or around 789 horsepower across the pond, ...

BMW's inline-six engines are loved among fans and have been around since the company's start, but only a select few can take the mantle as the most powerful.

Chances are, if you own something at least mildly sporty, there's at least a few aftermarket options available for you to ...