JoeRockhead:

No different than the AMG Black Series. Neither was designed for a wing like that but if you want to add downforce, your options are limited. A lip spoiler won't cut it. yes

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if you read the PR fluff for the M4 GTS , it is to celebrate the 30th anniv of the iconic " ur - M3 " ..so it should have used a different , bespoke to the model trunk lid with a  built-in F40 style " high wing " ...just like the 1986 model it purports to celebrate ......would have been the perfect way to come " full circle " .......instead they went cost saving cheap with a bolted on " ghetto/ ricer " style wing !