Thamks for the write up sandy. As mentioned previously fully aware of some of the 'dark art' as such any information shared is fully appreciated by a large number of us on the forums.
I don't suppose you happen to have experience of the air boxes used in the rallye reg link? I've got one here but it's just the air box at the mo and no mounting system etc for me to see about putting it together. (I'll grab a pic when back on my mac)