Originally Posted by BuraQ
No, actually it should benefit the Cobb tune, and no the Cobb tune does not leave any image behind after reflashing back to stock.
I cannot speak for the JB4 as it is not a flashtune. I would recommend the Cobb AP though
Cool, Thanks....I will let you know the turn out...For now I have the pleasure of driving a 2013 528i so I can't complain to much