This 2009 Nissan 200SX is powered by a 3.6 L S38B36 inline-six from a BMW M5 E34 boosted by a Garrett GT45 turbocharger. The built motor features 8.5:1 compression forged pistons, custom exhaust manifold, two 50 mm wastegates, and 3-inch exhaust. Behind the motor is a M5 manual transmission, shortened M5 driveshaft, and 200SX S14 differential.
Update: A commenter shared two more videos. The description states the motor is making 657 hp (489 kW) and 720 Nm (531 lb-ft) of torque.
Source: BOOSTALF Motorsport
657bhp @ 0.7bar
http://www.youtube.com/watch?v=6WWscJ6crzg
Thanks Stefan. I have updated the post to include the videos you posted. If you are involved in this project and have anymore updates please let us know.