Pál_K
Cameras. I has it.
The 911's 5 plus decades of race-track success ...
Volvo and Cadillac also participate in such types of races. You can take anything and modify it enough to "work".
In serious racing such as Formula 1, Formula 3, Indycar, LeMans (LMP cars), there is no rear engine design, never has been, and never will be, and for good reason - it's an inferior design with inherent problems.
Porsche deliberately gave the mid-engine Cayman a less powerful engine so as not to cannibalize 911 sales. You'll notice the higher-end, higher performance Porsche GT and 918 are mid-engine.