I thnk it would be close because the 5.0 is lighter engine but ther car is heavier and in comparisson the 6.0 is heavier but the SL is a lighter body. I would have to go with the 600 because the 600sel runs to 60 in like 6.6 where the 500e goes to 60 in like 6.2 and the 600sel is a massive car.