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Well, lately I've seen a decrease in responsiveness....weird it seems better if I focus my foot on the top of the accelerator....we all know the feel of our cars thru time. Whatcha think standard tuneup or throttle body clean?? If this helps when I punch it lags on downshift.
Possibly dragging brake caliper(s), especially if you eventually develop a vibration through the steering wheel at higher speeds (sign of warped rotor(s))
my K&N filters on my stillen CAI's were dirty as hell last time they were cleaned. Makes a huge difference once air can actually flow through them. lol