I remember all of that, it is still confusing. HA!
The long device that sits by the WUR and has the metal "moon" gate needs to be plumbed before and after the throttle body. A buddy of mine had one with an air filter replacing the intercooler line, really screwed up the idle and CO% readings. Those gates do not seal when closed and some models purposely are machined that way, to assist with smog stuff I guess.
I know you live in the great white north but I do not run an AAR or an AAV on my car. You might leave them off until you get your car tuned and running to uncomplicate things. You can always add them later.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8