Porsche’s development boss says that the Detroit auto show-stopping 918 RSR hybrid racecar will be developed alongside the open-topped Spyder road project, instead of replacing the 2010 Geneva concept.
The 756hp RSR mixes the hybrid systems from Porsche’s 911 GT3 R hybrid project, the engine from the RS Spyder racecar and the bodywork of the 918 Spyder, modified for vertically opening doors and a roof  … Pictures & Details