It’s really low...I haven’t measured but I would guess less than 2 inches. The exhaust hangs down in the middle and I think it would catch on the rolling jack as well (exhaust barely scrapes the front cross member of the lift when backing the car on with the race ramps). Here is a pic to show how low it is:

 

Nice work, I love your garage set-up as well! How high is your garage?

 

Thanks! It’s 9ft 8 inches or so. A very tight fit with two low cars.

 

Thanks, yes, my garage isn't quite high enough to put a lift in.

 

You can make it work-just section part of the ceiling in the garage!