Some (slightly custom) K04's have gone up on ebay (ported, polished and gas flowed ones) if anyones interested. I was interested myself but because there is no proof of a refurb (as he did it himself) I decided to leave.
http://cgi.ebay.co.uk/RS4-Turbos-tu...14&_trkparms=72:1683|66:2|65:12|39:1|240:1318
http://cgi.ebay.co.uk/RS4-Turbos-tu...14&_trkparms=72:1683|66:2|65:12|39:1|240:1318