I have a used Injen CAI for sale. I had it on my truck for a little over a year. This is the same as the TRD intake for the 1999 through 2004 1st Gen Tacomas with the 3.4 V-6. The part number is PF2055WB. It uses an Amsoil Nanofiber dry filter (part #X-1012-BR). When I got the intake, I also purchased the Hydroshield water repellent prefilter (part#X-1033RED) and the aluminum splash guard (part#HS5000P).
The filter is still in really good shape. It is a reusable (can be cleaned) filter. My engine compartment was a little dusty when I took pictures of it. All the mounts and needed hardware are included. It also includes two hoses. One hose goes around the back of the engine, and the other is in front of the engine and goes to the intake. CARB info is available from Injen if necessary.
It will make quite a bit more noise when you get on the throttle. My wife said she couldn't stand the noise, and I couldn't stand her noise, so it is time to get rid of it.
Looking to get $100 plus shipping.