Hey I spoke to Cattman. I just ordered the new JWT Pop Chargers / R2C Filter $180 shipped.
Keep in mind the prices on his website are old so to get an up to date price you need to contact him.
So! He just needs 2 more orders to start making the new Cattman Headers. I told him I'd let you all know since he doesn't have time to be as active on the forums as he would like these days. It would take a few weeks to make after the orders are completed. Once he gets the final orders he will contact about the down payment. Here is his contact info.

http://forums.maxima.org/member.php?u=459
Brian C Catts
Cattman Performance
Tucson, Arizona
520.575.6195
bcatts "at" cattman.com
www.cattman.com