The Ultimate Expression of Your Sports Car Passion--in a Four-Door?

What if you could get your hands on a high-performance German driving machine that competes with Porsches and Mercedes, doesn't cost a fortune, and even has a usable back seat and trunk? Meet the classic BMW 5-Series M car:

• Possibly the fastest and tightest-handling sedan ever manufactured
• Sold in the United States between 1988 and 2003 (three different models)
• With a plain-looking (but very BMW) exterior that earned it the nickname "wolf in sheep's...