Ok . I've spent enough time on this. I need to order a CAI but can not get the info I need.If I go AEM or Injen do I use the stock intake parts also. What comes off? What is the Stillen intake do? I see you need to order a Ztube als with them. With the AEM or Injen do you leave the stock parts upfront?

 

AEM, Injen, and Nismo CAIs are complete replacements. The Stillen, Jim Wolf mainly replaces the box with a filter and heat shield. As for which is better, the consensus here says they're all about the same. The stock intake is already a cold air, so a CAI with piping bringing the intake into the bumper isn't going to do that much good for you.

 

Edit. ^ beat me