[Overdrive]

I'm with Ghost. See what the code is for the sport exhaust on the S (didn't know they got one, personally), and then see if that code is on the label under your front trunk lid. If not, you don't have it from the factory, but that doesn't mean it wasn't added later. I also agree with what he says about the technician or whoever you're dealing with showing you how it is supposed to operate if you do indeed have it.

From the factory I believe the control is there, but I'm not sure if installing the exhaust afterward and not inlcuding the switch means the valve will only work past certain RPMs or throttle inputs, or if the valve is simply constantly open/closed when that control switch is not present. Can someone else with background on this confirm?