Here's a blurb on the X51 package offered for the early 2006 997:
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The Club Coupe is the first in the current generation of Porsche 911 sports cars to be equipped with the X51 Powerkit. This feature increases output of the 3.8-liter, flat-six cylinder Carrera S engine from 355 to 381 horsepower and peak torque from 295 to 306 ft. lbs., making it the most powerful non-turbocharged engine yet offered in a Porsche 911 production car for North America. Distinguished by its carbon fiber air cleaner housing, the X51 Powerkit boosts performance through a series of engine enhancements including a larger throttle body, optimized intake airflow, cylinder heads and exhaust manifold modifications, changes in the control unit, and the inclusion of a sport exhaust system. The result produces a 0 to 60 mph time of a quick 4.4 seconds and a top track speed of an impressive 186 mph.
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I don't think that the 996 X51 package had as much "go fast stuff" as the later 997 X51 package. The 3.6 with the X51 increases output from about 320 to about 345, if I recall correctly.
-Wayne