Greetings Listers, I need to replace the front rotors on my 84 4000 Quattro. Should I go with Zimerman slotted or a cross-drilled rotors? Any pro's and cons to help me decide between the two? If it matters, I've already got PBR deluxe pads that have been kicking around in the basement that I plan to use. Thanks, Chuck 1984 4000 Quattro