I installed the Eiback 1.5" pro kit and a Cervini B-2 chin spoiler. The bottom of the chin spoiler is right at 4" of the ground. I do have to watch for big bumps, steep cross gutters, and possible obsticles in construction zones. Every driveway approach i enter or exit i have to go at on a 45 degree angle or i could tear the spoiler and bumper cover up beyond repair. Responsibility does come with a lowered ride, but its well worth it in my opinion.

Heres a pic...
[img=http://img157.imageshack.us/img157/8052/stangs165rc2.th.jpg]

[img=http://img208.imageshack.us/img208/1738/stangs168mn7.th.jpg]

 

I drive mine very carefully!