What brake cable (or kit) do I need to do this?
I will have to bleed it right?
if its mechanical it wont need bleeding but I dont think there is a mechanical XTR brake so you will need longer hoses and some fluid and you will have to bleed it
Yes, longer hose (surprise surprise!) and bleeding.
[url= http://www.chainreactioncycles.com/Models.aspx?ModelID=52552 ]CLICKY[/url] - Something like this is for you want to completely replace alternatively most hose is availble for about £6-7 per metre.
As for oil just got to local motor factor and get some dot 4 or dot 5.1 brake fluid
shimano use mineral oil not dot fluid so don't use dot fluid - you will ruin the brakes
and you will need a little yellow goodridge tab for extra too cool for school points.
You'll probably need a new olive and insert too.
Do you mean hose?
If you do then get some compatable goodridge hoses and a small bottle of mineral oil from CRC and the like?
http://www.chainreactioncycles.com/Models.aspx?ModelID=2938 - goodridge hose
http://www.chainreactioncycles.com/Models.aspx?ModelID=20424 - connectors - not cheap - check the fit your version of XTR?
http://www.chainreactioncycles.com/Models.aspx?ModelID=29899 - mineral oil