The stock 200 oil cooler is pretty small, and has no where to mount under the CQ that puts it in the way of any air. The S2 has a complete oil cooler assembly which includes ducting and shrouds, and the RS2 has an even nicer looking assembly. Cory and George fitted an aftermarket cooler, then were dissatisfied with the fit when the bumper cover was installed. So now it has an ur cooler from George's heroic-but-now-bent urq. Instead of using ductwork, it is mounted forward, snug against the airdam grill as in the Treadway car, which utalizes a large aftermarket cooler.