TCS is part of the ABS system. It simply activates the ABS system to slow a spinning tire. It is not like the new stability programs (i.e. on Licoln LS or Mercedes). If you have ABS, then all the hardware is there. However, not all of the software is necessarily there. If you have an SVT with TCS, then you got a "supercontented" ABS control module (ABS & TCS). It could happen. Especially if they were short ABS only modules during Final Assemmbly.
TCS has nothing to do with the throttle body at all. There is nothing special about the SVT that would prevent having TCS, but I bet the ABS/TCS module costs a pretty penny.
