Yep only 19 Z-Tunes ever made, they are basically hand built by Nismo. Only around 5,300 34 GTR's ever built of any kind, which is also pretty special!
OUCH http://www.bangshift.com/blog/Pay-Up-Sucka-Honeywell-to-Pay-Borg-Warner-32.5-million-over-Turbo-Patent-Lawsuit.html
http://www.autonews.com/apps/pbcs.dll/article?AID=/20110516/OEM01/305169769/1424
This is good news for Garrett turbos, they can now manufacture turbos with Ti wheels!