We have the ZL1 front bumper on our JDP SS and the car is lowered about an inch or so. Yes, you do have to be careful, but scraping is avoidable with techniques and taking proper angles. We live in Salt Lake City where we have deep gutters and steep driveway approaches due to our runoff, but we normally do not have a problem. You can't go strait on at things, but you really can't even do that at stock height. Angles are your friend!
Best regards,
Tyler
888-308-6007