I bought the 2015 Corolla S Premium because I wanted the top of the line model. Mine just says S on the back. Today in the parking lot of my office, I saw another new Corolla with TRD WTi badge on the back. Is this a higher trim? I confirmed with the dealer that mine was highest. Anyone know what the TRD WTi is? It even had grills on the front fenders that mine does not have.