I don't even think the M3 looks that aggressive to be honest. I suppose you could swap out the side skirts for 335 ones, and have a custom rear bumper fitted; but this whole thing seems kinda silly? Why buy a car you don't like?
12 E70 X5d Black Saphire/ Tobacco
08 E92 M3 SG/Fox Red Gintani Race, RG63
09 E90 335xi Crimson/Saddle 02 E46 M3 Cab Imola/Black (Sold-RIP
)97 E36 Z3 1.9 Atlanta Blue/Tan (Sold)