depends how big the curbs an speed bumps are
. nah, but i'd say u could lower around 2 inches an be fine. i had 17's on my accord w/ the H&R Racing drop which is around 2.25 in the front an a lil lower in the rear (i think). my drop was over 2 inches an was fine. jus gotta take it slow an be careful as with any drop. good luck.