BAM or AMK?
The tubes leading into the intercooler (#22) are the hard charge pipe and wide rubber hose off that.
Two outlets from the top of the charge pipe - one to the diverter valve (#6) - the other to the N75 (#9)
#10 - MAF sensor. #11 - Airbox
#12 - 'Hockey puck' valve (other end vents to TIP which connects to airbox).
#18 - PCV valve which allows oil vapours back into the intake when throttle is open. Otherwise, vacuum from inlet keeps it shut.
The odd arrangement #19 and #20 in the boxout is normally bolted on TOP of the engine and I think includes the N249 vacuum box. That's probably #20, because its other end links back to the DV #6.
All of the above from memory so anyone correct me if wrong..
Hope this helps
Alex
P.S. it is the pipework between #12 and #18 (including the one way valve inside the #18 T-piece), located from hockey puck down to beneath the inlet manifold, that tends to turn to chocolate, and the right-angle bend hard plastic pipe coming up from the sump is fragile too. If you work with these pipes, expect them all to break, and replace most of them. The piece that connects into the crankcase at the top and also the hockey puck can be bought as one 'Y-shaped' section, a silicone part.