Jacob Lee

I'm about to do my brakes with a friend for my 2012 e63 amg. I've been on here for couple of weeks lurking and reading. A couple of questions I'm hoping for answers on. I'm buying oem from benzpartsdirect left and right rotors seem to have the same part number, I thought the rotors were directional. Are the left and right the same? it seems that way for front and the back. Also would like a current consensus on air filters and I would love to some exhaust work done I have a great reputable place here in Miami and am wondering what I could do and avoid CEL's (I think that's the right term). I would also like renntech to lower it without the DLM anyone have any experience with that kit? Thanks in advance for any input