The concluding SLR will feature an open-air only construction. Gone is the roof; gone is the windscreen - a small wind deflector will be the singular element between the SLR's occupants and the great outdoors. To reduce weight, a carbon plastic body will be used, while air conditioning and power windows will both be abandoned as well. The result in a weight savings of some 200 kilograms, enough to help the model reach 186 mph from a standstill in 26 seconds and achieve a top speed of 217.5 mph
First Shots Of The Mercedes-Benz SLR McLaren Speedster | eMercedesBenz - The Unofficial Mercedes-Benz Weblog 