Yeah I got a ractive intake and it sounds badass. You can even hear the valves open and close at WOT! To install it, remove the entire airbox and use it as a paperweight. The nuts on the screen inside the airbox are actually welded into that metal plate. You can't get them out. I just got 4 screws and nuts from pepboys to bolt on the adapter. It's real easy, only a 10 minute job.
I just ordered that plate for the Ractive air filter....on the second generation altimas theres that air flow tube...it has that little wire attached to it...does anyone know what that does??? It's right next to the battery on the right side of it...I have no idea what it does and I don't want to remove it and then my car quits working or something blows up...help!