Wow that sounds hideous. I have a 1.8 TSI and dread to think what a back box AND res delete would sound like on that.This. This. And so much this.
As an owner of a 1.4 with a backbox and res delete, just do away with the backbox. I'll be adding my res back soon as the drone is rather irritating.
https://streamable.com/59l2z