Are there any places one could get performance parts for a 6000, like a CAI? Also, would headers for other 3.1Ls bolt up to a 6000?

what year and motor ?

I dont thinnk you will find many things that are just for you 6000.
If you hav the 3.1 then maybe the headers would work, maybe tight though.

On the CAI, you'll probly just hav to fab something up that works.