Hitch a ride in a BMW M3 CSL, and grab a driver’s-eye view of the sublime Porsche 911 GT3 RS 4.0 at the Nürburgring-Nordschleife. For many BMW enthusiasts the lightweight, 265 kW/360 hp E46 M3 is the ultimate ‘M’ model, with Sport Auto recording a lap time of 7:50, back in 2003. However, Porsche’s 997 swansong, the 368 kW/500 hp GT3 RS 4.0 has an official time of just 7:27 minutes…