You can buy the factory front and rear metal M3 replacement panels from germany and install them on your car. An extensive amount of work, professional installation will be needed just like KRAUT said. But you can buy them.....
The front fenders are $353.77 each
The rear fenders are $968.13 each
The rear spoiler is $1,272.24
The front bumper is $1,344.78
The rear bumper is $1,149.48
The side skirts are $387.25 each
A measly $7184.80
Fasteners, labor and paint.
Then add all the other small things I forgot.
I can't understand why nobody does it.
P.S. After all that you would still be a member of the M-poster club....