AutoWeek spies have caught the beefed-up 2007 Mercedes SLR McLaren -- we're talking 641 hp, a weight savings of 90 lbs. thanks to carbon fiber and other considerations, and a 0-62 mph time of 3.6 seconds -- faster than the Murcielago and Carrera GT. AutoWeek also comments on the changes to the front and rear fascia, which should serve to help airflow and keep the car under control despite the extra juice.

Look for the super-supercar to debut in Paris this fall.

[Source: AutoWeek]