The E60 M5 will soon be replaced by the F10 M5 which will have as its powerplant a twin-turbocharged V8. I, for one, will lament the passing of the V10 as the powerplant of choice for the businessman’s express, which is what the M5 has become through all its iterations.
October 2009 marked the 25th anniversary of the BMW M5 series and on this occassion BMW’s M division rolled out, as M division head Albert Biermann called it, “the M5 CSL we never built”.
First off , the mighty 5.0 liter V10 engine was modified by increasing its displacement to 5.5 liters. This was done by increasing the stroke of the highly strung V10. Official power and torque figures were never disclosed but hints and whispers here and there place the output of this stroked V10 at 580-600 horsepower with 400 lb-ft. of torque. A carbon fiber manifold was fabricated, increasing airbox capacity. A duct was placed where the front license plate would normally be, in order to provide additional airflow capacity as well as feeding a secondary oil cooler. A 7-speed Getrag gearbox handles transmission duties. The suspension was also revised to cope with the car’s upgraded dynamic capabilities.
Just adding power does not a CSL make so the interior was stripped and like the E46 M3, a carbon fiber roof was installed. Front seats were replaced by carbon fiber shells and the rear area was left bare. All this reduced the weight by 50 kg. Not much, by CSL standards, but it should help in this one-off’s handling manners. Like all high-performance BMWs, the acid test is how rapid the cars fare at the Nurburgring and this baby reportedly did the Green Hell in under 8 minutes. This rapid ride will not be duplicated and it will remain the one and only E60 M5 CSL in existence.
Source article and picture gallery here.
25th anniversary M5 video follows: