Jack/all:
The slots on the front fender of a 300D are for cold air intake; feeds directly to the airbox.
I think electric fans could improve the volume of airflow-don't know about louvers, 'cuz when you start punching holes in panels you're disrupting the airflow as was designed by those pesky German MBZ engineers.
Y'know, I bet they gave all of this some thought, no?
