Header, Intake, & Exhaust - Headers question!?

I bought a set of 4-2-1 headers for my 95 lx and they seem to be working just fine. Except for when I'm sitting at a stop light or just chillin in my car before class, I hear a rattling noise. It's not constant though. It's sort of off and on. I don't know what it is, but it wasn't there before the new headers so I'm assuming it's them causing it. Any help would be appreciated!

it could be the extra header causing the rattling, since a civic only needs one header:D

Damn you Sacicons! You beat me to it...

I take it someone else put the header(s) on for you... sounds like they may have put the o2 sensor on wrong. Just one possibility.

Thanks for the suggestions. Good call too. Yes a friend put the header in. Any advice on what to do if it is in fact the O2 sensor? Do I just re-tighten it? I know these questions gotta sound stupid.......I'm just new to the game though. Thanks.

yea it could be the o2 sensor and it should be thereaded into the side of the header.....is you car idling at normal RPM sometimes when it idles low it causes the things to rattle

Thanks blackhatch for the input....but I already found the problem!