Every time I take a semi-sloped turn aggressively, either the bottom left or right of my S4 bumper scrapes the ground. I've felt under the bumper with my hand and there are no abrasions which leads me to believe that the part rubbing is the tiny lip on the underside of the bumper that is the farthest back and underneath the car. My wheels aren't rubbing which is good and I'm running H&R street coilovers. What can I do to eliminate this? Should I raise the car a few cm's or can I stiffen the ride without switching to race coilovers? I would like to figure this out soon because I feel that this annoyance will just be magnified at the track. Thanks.

If the part that's rubbing isn't necessary, I'd wack it. Less weight too!