ive got 17" and gaz coilovers, i found it a right pain in the arse to stop it rubbing tbh, the drop overall is prolly about 20-25mm but it was dropped lower but i couldnt go round a corner without it rubbing the top of the arch, so i basically had to raise it right up to stop it, still looks ok thou, and the handling is way better now, but im not sure about a 30mm drop using un-adjustable stuff, would be great in sweeping curves, but parking or pulling out of t junctions ud be gritting ure teeth with the sound it would make imo