There is loads of info here:
www.nurburgring.org.uk
Well worth a look, and the ring is well worth a visit. I have posted some pics on here from my last visit:
http://forums.sidc.co.uk/forums/772698/ShowPost.aspx
You can get them from here http://www.slowboyracing.com/subaru.htm Click on 'intake' on the right hand side, then 'inlet hose'.
And they ship to the UK.