Roadsters combine the convertible feeling with superior comfort. drive it! put the Porsche Boxster and BMW’s Z4 through their paces. Both feature a retractable steel roof and are certainly impressive to the eye - but are they actually as fantastic as they look? We examined how they coped with stowing away a golf bag. On the powerplant front, the Boxster had a 2.9-liter mid-engine with 255 hp, while the Z4 we tested was driven by a 3-liter unit delivering 258 hp. Their prices in Germany start at 46,500 euros and 42,900 euros respectively.