if you visit their ebay item for it, it doesnt look too low.
http://cgi.ebay.com/ebaymotors/87-91...Q5fAccessories
the package they use to ship it is 12 inches tall. but looking at the pictures from mounting point to lowest point. it looks like its anywhere from 6-8 inches, ill contact Ken at Shine Auto tomorrow and see what he says in height... but unless your car is ridiculously low, i dont think this will scrape.