[Biturbos4] Misfiring on multiple cylinders

[Erik De Bonte (MSN)]

My 2001 S4 recently started misfiring on cylinders 4, 5, and 6 under load.  Does anyone know if the VW/Audi ignition coil recall from a couple years ago covers the 2.7t?  I found a couple sites that said it affected all VWs and Audis (ex. http://www.vcertt.org/news/10-03.pdf), but others listed specific models/engines that didn't include the S4.
 
Also, does anyone have any intuition re: what might cause misfiring on 4-5-6?  Just a coincidence, or is there something ignition related that those cylinders share?
 
Thanks,
Erik