if you feel like the engine is losing power compared to stock its probably Knock retard,
mine do this the first 15 minute and then replace and now feel very good, be sure you are not sucking hot air with your intake.
If you have a short CAI i suggest a heat shield at least if its not already done, what i did is a Fender well intake and i have no problem since.
It can be also your belt like Willwren said. If you dont see the boost gauge go high.
With the 3.4 i go at the end of the "yellow part of the guage".
If you have normal boost , i will tell you what members here told me when i install mine
, scan the car if you can, this way you will see " live" whats happening.
ps.. you will like that extra boost.