I installed an Injen SRI and now when my engine idles low, if warm, I get a rattling sound from my engine.

Any ideas?

 

Maybe your intake is rattling against something.

 

Can you be more specific? Maybe post a video?

 

check to see if the connection point from the intake to your vehicle are not lose. I started getting a rattle and when I checked apparently one of the nuts had come off from the vibrations so I got a nylon lock nut.