Not really sure why you would bother making your own. The aftermarket ones are like $70 and OEM are $130.
'08 E90 328xi, PlatBr, ZPP, ZCW
Winter: Dunlop Winter Sport M3 on OEM Style 268s.
Now: Conti ExtremeContact DW on VMR V710s, 245/35/18x8.5 square.
Matte black grilles and blacklines installed.
Euro Bixenons, AFE CAI, BMW PE, AA tune coming soon.