I have an Infiniti Q45 Sport w/ A full IMPUL body kit. It lowers the body 2 inches all the way around.
I also (just 8 months ago) installed spring compressors on the front and dropped the front 1.25inches..
The front edge of the bumper is 5" off the ground.
Last week I was on a side street I've never been on and hit a dip in the road at about 25-30mph. It wasnt maked and I was looking at my gps.
The front edge of the bumper hit square.
THe worst part is that I had just repaired some dings in the bumper over the holiday.
The 'cracks' are were the repairs were.