I'm experiencing this same issue right now with my 2010 GTI at 65k. Slight hesitation under partial load at around 2200 and again around 2750-2800 rpms. Most noticable in 2nd gear and not noticable under greater load. Also seems to be accompanied by poorer gas mileage (mid single digits as displayed on the MFD) when accelerating in those low load conditions in gears 1/2/3. No CEL's as of yet.
Edit: I also had a P2015 code a while back, cleared it, and asked dealer about intake manifold. They said it wasn't covered under warranty so I didn't have them look into it as they wanted $80 to look at it. Didn't document. Does the P2015 code affect performance at all? On the TSB I've seen it says *does not affect performance*