MJ,
No clearance problems at all. My car has been lowered quite a bit, probably at least to euro height if not a little lower. My driveway has a sidewalk height rounded bump. I never scrape on the back, but occasionally graze the crash bar on the front if I get the angle wrong, but its a light scraping that doesn't make me cringe too much.
Glad to hear you are getting set up!
Good Luck!
Nick.
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Nick Shumaker
1982 911SC Coupe
nickshu@yahoo.com