that picture is of their prototype header before it was fully tig welded & coated... its a true equal length header, stepped primaries, true merge collector, and dyno'd on 91 octane +23 whp on the Nismo using sae corrections while using the stock Nismo h-pipe exhaust. the car is from outperformance shop in tx. They've got another nismo 370z doing the headers, intakes & other mods next month.
they've also got the Injen intakes (+13whp), eneos 0w50 (+10whp), ppe headers (+23whp), and an exhaust on the way.
I'm hearing that they're getting exhaust cams pretty soon and a ecu.
Found some of their videos on vimeo.
http://vimeo.com/8566779
2010 Nissan Nismo 370z Injen R&D Dyno Session1 on Vimeo
I'll post a dyno of my stuff when I get it installed.