Running cross-drilled Zimmermans for over a year, absolutely no cracks, no problems.
Only reason I'd go back to blanks is if I was tracking the car, but for spirited daily driving with some light auto-x, the cross-drilled Zimmermans have held up incredibly well
Dinan CAI_Stage II_3.46 Dif
OEM CF Strut Bar_Eibach Sportline_GC Konis
OEM Gloss Grills_H&R Spacers_Clubsport Sills_Painted Splitters
Amber LED Corners/6k HID Fogs/LED Interior_Shadow Emblems
500W_RE Audio_Hertz Components