The way I figure, the center of mass is very critical to drifting. The IS seems to be built with the center of mass in the center near the center of the car. The SCs build appear less centered and more posterior(excuse the bio term) located. The long front end of the SCs give more engine room but a less evenly distributed weight IMO. I'm not speaking in terms of speed though. I'm just talking about mass distribution for drifting.