How many pulls did you do on the dyno? I took mine 2 weeks ago to see what my baseline was (mine was stock except for cold air intake) and on the third pull it put down its max hp. Pulls 1 and 4 were under 400hp, but pulls 2 and 3 were 400 and 403 IIRC. Apparently on the QC they pull a little harder, at least on the dyno, when the engine is warmed up. I ran mine on a dynojet as well. Just a week ago I got the Roe Racing 93 octane SCT tune and responsiveness is definitely noticeable. Hopefully soon I'll get it back on the dyno and see what it gained.
-Jason