I took a break from school and homework today and finally took pics for those that wanted to know the ground clearance of the spoiler

this pic is from the side walk curb. there is approx 4 1/2 inches of ground clearance

That measurment is realtive to what you have the ride height set at. Do that same measurement on flat gound. Then measure the height of the top of the fender lip to the ground. Some cars might sit higher and have more spoiler clearance.