Can a car crash ever be positive? Just ask collectors who seek the rare Alfa Romeo Giulietta SZ, a lightweight racer that could also be road driven. In major European sports car races, the Alfa became known as a giant killer for its winning ways. It all started when a race driver had an older Alfa re-bodied by Zagato after a crash. Alfa Romeo like the result enough to commission 200 copies from the famous coachbuilder. Bonhams is offering one of those at its Amelia Island auction, with a pre-sale estimate of $350K-$400K. Meanwhile, Gooding & Company’s Amelia Island auction also has one of these rarities, also red, with an estimate up to $500K.