It seems there is always someone out there seeking perfection. For most buyers, the BMW 5 Series will fill every need. But for those few who desire more of everything, and can afford it, there is the 2006 BMW M5. With an astounding 500 horsepower produced at the touch of a button from the 5.0-liter V10, the M5 is one serious performance sedan. That 500 horsepower is only available when chosen. The M5 offers driver the option of the standard 400 horsepower or the 500 horsepower by pushing a button on the dash. Distributing the power to the rear wheels is a seven-speed automatic transmission offering drivers diverse shift settings. The M5 also wears braking upgrades, a revised suspension, and 19-inch rims