Actually, the lowest point on this exhuast is about 6-12" behind the rear wheels. If you look at the departure angle the tips will drag first and this will happen with any exhaust with 4" tips.
What you have to watch out for is tall speed bumps, objects in the road, or strategically placed and deep potholes. Which hopefully you are already watching out for with such a low car.
Still have not heard of any issue with scraping though.
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09 370Z - FI TDX CBE/Stillen G3/FI HFC's are next
06 Xterra OR - 3" SL - 33" Pro-Comp MT's - Shrockworks Sliders & Rear Bumper/Tire Carrier - Stillen Cross Drilled Rotors/Pads