I think the ITR uses it's own specific intake manifold therefore the throttle body is different, so no others won't fit. Could be wrong about that though.
A CAI will give you 2-3HP tops over a SRI so it's more butt dyno than anything else.
You might want to check out Injen they make decent stuff and might make one for the ITR. If not look into Comptech's icebox.
You willing to sell your CAI?
