This is the 911 GT3 given a special modification treatment from Sharkworks. This is not the 2010 GT3 and I have not heard of Sharkworks before but it appears they do some nice work with the engine.
From their Youtube page:
"The build-up of the 3.9L 500hp naturally aspirated GT3 engine by SharkWerks & EVOMS and a look behind the black magic that is Porsche Tuning with the EVOMSit software. Dyno testing, tuning footage as well as track testing footage at Willow Springs Raceway by Cort Wagner. Comparison with a stock 3.6L GT3RS and a cameo appearance by a 2010 997 GT3...."
This video is 9 minutes of Porsche modification goodness. Enjoy.
Learn more at Sharkworks.com