FWIW,there's been a long running debate in the 8P forum,and over on VAGOC about stock coil packs,RS4 packs,and even the hideously expensive Okada coilpacks,and whilst I don't know how this will translate to your cars,but those packs cost over £600,and deliver a few bhp at peak rpm.
Most of us took the view that if your own packs were finished,the latest TFSi packs were worthwhile,but the gains if any,were very small indeed.