So has anyone got a diagram of how its all plumbed in on an S4? Its impossible to totaly see from all the enginebay pics ive seen.

Hexxon mentioned its a split system that meets just before the throttle...

Well look at the pics, the pipe between the the throttle and the 2nd intercooler is very short, and between the various pics you can see it from all sides and all thats fitted to it is a dump valve (with a very long tube exit which vents by the screamer pipe for some reason ), no special valve that switched between the 2

Hence why it always seemed to me it went filter-turbo-intercooler1-supercharger-intercooler2-throttle, as that how all the piping in the pics make it look