I don't have a Steeda T/A, but I think you SHOULDNT see any gains when on the spray with one. Reason being is because you shouldnt advance your timing while you're spraying. You'd be more likely to detonate and blow something. The T/A is suited best for n/a applications or decreasing your timing in non n/a situations. I could be wrong here, so someone else chime in.
2012 Silver GT, M6, Brembos, 3.73s, Lethal OR-H, K&N, tuned