Tried installing on a 2002 wrx, cut the coupler about an 1/8 too short on the turbo side so the clamp would no longer hold the coupler without sliding off. It does make contact with the tv a on the coupler, and if you plan on running your pcv system (many delete this for an AOS) then you will need to come up with additional plumbing as you will be supplied with a plug for the pcv system. It also locates the pcv port under the intake manifold, rather than behind and clear of it, which makes any solution extremely difficult.
Gonna leave 5 stars because it’s still a beautiful piece, and it’s earned a reputation as the best inlet out there, hence why I paid the premium for it, it just didn’t work for me. Double and triple check that it will work for you before installing as the second you follow the instructions (trimming the coupler) you void the ability to return it.
I ended up buying the tomei, which fit without any modification at all.
One of my picture shows my attempt at a pcv solution using 1/4npt to 1/2” hose and an elbow.