I've also noticed a shortage of Cosworth supplies. I even made a thread about it:
http://www.ft86club.com/forums/showthread.php?t=108106 but never got a response from Matt or RallySport.
As of now, many of the Cosworth products are listed as discontinued on RallySport Direct's page. The lead time on the 0.2 exhaust is over 200 days and the 0.1 axleback is now discontinued. If you check Nameless's site, the 0.1 is not listed there either.
I still want to buy the 0.2 midpipe, but I'm running out of places to buy it. I found a distributer in the UK but they told me to buy from RallySport which may or may not restock.