I've just had a chat to the guys at Zorstec as they seem to know their stuff:
http://www.zorstec.net/main.htm They can make us up high level link pipes which would fit between the original headers and cans (you'd just need to sort the can mounts) for around 100 quid for a twin system, or less if you've got a two-into-one.
This is a specially negotiated (by me!) club discount price and we'd need to get at least ten orders for this.
'm assuming that a monster and SS would not be that much different?
Anyone interested? How does it compare for cost?