Rails are 11cm, exhaust is 7cm.

Side skirts clear trailer by 3mm when driving up the ramps and the doors clear the trailer rails (with me out of the car) by 1mm...

I "could" go lower... lol

Just wait till Steve posts a pic of his car and you'll see how much the tyres are tucking... My car is at the same height, but cos of the 14"s and the huge flares it looks like its 4wd spec, haha.