I know there are several companies that make CAI for the WRX, like AEM and Injen, but who else makes them? If you know please post any websites or links. Thanks in advance.
I believe Larry Ganz (ganzflow) makes one, K&N is supposed
to have one coming out soon (Feb.)
your best bet is the search feature on i-club - type in "cold air
intake" or even "CAI" (it might need >3 letters), and you'll
find a MEGA-TON of threads on these...(you could also look
for North Ursalia's mod's site, which should list the types of
cai's that people have submitted to him)
