A camouflaged Ferrari F430 has been spotted by spy photographers near Germany’s Nurburgring circuit. Its new exhaust pipes positioned higher up in the rear bumper than the standard model reveal that this is in fact the Challenge Stradale that's due to be unveiled at September’s Frankfurt Motor Show.

Key features of the CS are its lower mass, brought about by replacing many of the standard version's parts with lightweight carbon-fiber, and a slight bump in power. Engineers are believed to have shed more than 100kg through the weight saving program and power is expected to be boosted to the 520hp mark thanks to exhaust modifications.

The images show camouflage material surrounding the bumper and rear intakes, which suggest these will be different from the standard car. Also, the front wheel arches appear to be wider than the standard model suggesting this car might have a wider track. You can see a few more shots of the car over at AutoWereld.