Tested: 2006 BMW Z4 M Coupe vs. 2006 Porsche Cayman S
Tested: 2006 BMW Z4 M Coupe vs. 2006 Porsche Cayman S Tony Quiroga © Aaron Kiley - Car and Driver From the Archive: Two used-to-be roadsters from BMW and Porsche battle it out for the hearts of purist drivers. From the August 2006 issue of Car and Driver. The tradition of sports-car automaking in recent history has been to turn out a roadster, wait until sales slip, then produce a hardtop to pick up the slack. To the non-enthusiast driver, the idea of turning a perfectly good convertible sports car into a hardtop coupe must seem as pointless as the plot of the film Snakes o...