I/m in the same boat - have a G35 Coupe, but need to carry bikes. The car is notoriously difficult to fabricate a rack for due to the low ground clearance and airodynamic plates underneath. I'm considering going in with a bunch of other coupe owners and getting one of the 150MPH racks from Bird auto (last link below).
Are you nuts, on a car this nice: putting a grimy bike inside with all the sumptuous leather
No, the G is very tight inside for space. My old RX7 had at least twice the room in the hatch than this car has - excepting the rear seat itself (the tunnel is not much bigger than an 6 slice toaster). Not that I would be keeping a rack on this car much, possibly only for taking the bikes down to Cali or Arizona. We use the old Altima w/Thule for regular regional riding trips - not as much fun when going far afield as the G. I would never consider any rack that involves permanent modification of the car or unsightly mounts that can't be removed.
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