I'm curious whether the 3.73 (18"wheels) or the 3.92 (20" wheels) rear gears works out better for acceleration. The infamous Road and Track test that obtained such a horrible 0-60 time was on a 3.92, but normally we'd expect more acceleration from the higher numerical ratio. I'm not that into the factory 20" wheels, but might spring for them if that package makes the car noticeably quicker.