Like a proper performance special, the CS has substantially reduced weight, about 240 pounds worth, thanks to reduced sound proofing, no carpets, carbon fiber door panels and center console, a lexan rear windscreen, composite bumpers, lighter exhaust system, alcantara-trimmed carbon fiber seats (along with much of the rest of the interior), and carbon ceramic brakes from the Enzo. This is paired with a more powerful engine thanks to a higher compression ratio, revised intake manifold, ported cylinder heads, and larger air mass meter, and revised engine software, which raise the power by about 25 hp to 419 hp, giving the car an impressive specific output in excess of 115 hp per liter thanks in no small part to a screaming 8500 RPM redline. The gearbox was revised to provide 40% quicker shifts while the aerodynamics were revised to provide a remarkable 50% increase in downforce thanks to revised front bumper and side skirts, as well as a new rear diffuser. Finally, the suspension was upgraded with 20% stiffer springs which also lower the ride height slightly, as well as a larger rear sway bar to provide more front to rear balance.

The resulting car has a much harder edge while still being streetable, transforming the 360 into a superbly exciting driver’s car that highlights why these cars have become so collectible. This particular Challenge Stradale was sold new by Ron Tonkin Gran Turismo on the 6th of August 2004 to a resident of Northern California who retained the car until 2007. It spent the next eight years with an owner in Nevada, before returning to Northern California, where it has remained since.