With just 1,815 units produced for North America, this 2007 BMW Z4 M Coupe delivers raw power and collector-grade rarity.

Singer has reimagined the rare wide-bodied 911 Carrera SSE. The 964 shell gets fat carbon fenders and a 420 hp, 4.0 flat-six.

The 156 GTA was meant to rival BMW's E46 M3; it failed miserably and lasted just three years but still is a rare, if flawed, ...