Originally Posted by BLKFIN
Unfortunately you will never see the 26hp for the intake added to 40hp for the pulley and 20hp for the tune. You get a “blended” amount of these three mods working together that is much lower. 
Usually that is very true. You can't just stack the numbers and get a total - like I did above. However, those are the numbers from having those items stacked in that order. By that I mean Rob @ NW dynoed his car stock and then with the CAI. He got an increase of ~25 whp. Then another person (I can't remember who - might have been SRT Dan) dynoed their car with the NW CAI, then again after adding the Code3 pulley. He got an increase of ~30 whp. So those numbers stack. As long as you work it that way, you can stack the numbers.