Welcome! Looks like most of your list was answered. Use Google to search this forum, "site:rs6.com intercoolers", or the like.

VC's do like to leak, finicky seal. IC's can be replaced by a few companies, SRM and AMD are upgrading them now I think.

You can find some random info and manuals on my website, in sig below.

Get Ross-Tech VCDS, priceless...