However, while manufacturers started employing spoilers at an earlier stage ... aerodynamic package. Inside the trunk stood a massive rear wing that owners could mount at their own risk since ...

“In fact, we didn’t officially put the spoiler on the car ... BMW delivered the 3.0 CSL with the wing in, rather than on, the trunk to avoid having to re-homologate the coupe.

You can get an optional wing mounted on the trunk lid and even a roof-mounted small spoiler, but this prototype appears to be echoing the M4 CSL launched last year as the M3 E46 CSL's spiritual ...