advice on lowering

i just got 18 inch rims and would like to know how far to lower it, i know some custom drilling might have to occurr, but if some people with 18s could please post some pics of how lowered there car is that would be great, im thinking like 1.5 or maybe 2, i just dont want to be dissapointed, thanx

I have Tein SS springs with 2" drop with my 18’s and they are fine, no rub.There is only a 7/10th of an inch diff in rolling diameter between 35 series tires and stock 195/60/14. 7/10th taller that is.With a 2" or less drop you wont come upon any probs.Any lower than that and the tires will rub on the inside while turning=bad.