Maybe try:
http://forums.nicoclub.com/pathfinder-forum-qx4-forum.html
or
http://www.thenissanpath.com/index.php
I'm new to Pathfinders as I have just recently acquired one, so not sure how much help I can be.
I see all over the web people looking for 3.3 headers for their pathfinder. I joined just to reply to this post and get more people interested. 15-20 sets isn't much. Let's get some people out of the wood work on this one.