Could be the girlfriend, although still makes the noise without her in it LOL. loosened the belts, doesnt seem as bad now though is still there a little bit.
I suggest removing her from the boot

Anyway, i had that sound when i bought my GTi it sounded like it was supercharged? Whinig that got higher in pitch as the revs went upp. I foud that the cam bet tensioner was to otight. So i just untightened it a bit and the noise disapeared. I didnt otice any difference in performance when it was/wasn't whining.