[Stag556]

The purpose for the CAI is to A. flow more air and B. flow colder air. It doesn't make the engine louder at all, you just hear a slight whistle as the RPMs go up. Thats the air being sucked in to the intake. The dealer will install a TRD intake only but they might charge you alot. The install is so easy that I would feel like less of a man if I had someone else do it. haha.