little late to the party, but...
I noticed a pretty significant difference in cold starts when I (forgot) to put the dividers back in.
Only change along with that was a slightly thicker headgasket.
But the cold starts got quite abit worse without the dividers.
Now maybe its possibly RS4's injectors multiply this, I dunno.
Next time my intake is off Im gonna take the rest of the flappers out. I cant imagine the cold starts getting any worse. I dont drive the car in the winter anyway so its mostly a non issue for me.
Just putin' my info out there.