330Ci ZHP package rim/tire fitment questions

hey guys,
i've spent the past while searching for an answer to my wheel fitment questions. i have an '05 330Ci with the ZHP package. i want to order 19" BBS CH rims, bright silver finish. i am going to lower my car (not slam it) with an h&r cup kit or a set of coilovers. what is the most aggressive wheel/tire size that i can fit without having to do substantial fender rolling/modding? thank you in advance. pic related, my car

Our recommended fitment if you were attempting to do a staggered set up would be 19x8.5 ET35 in the front and 19x9.5 ET45 in the rear. Now we could guarantee no rubbing issues with this fitment on stock suspension. If you choose to lower your car, you could get away with a lower offset, but I could not guarantee you wouldn't need fender modification.