Grant:

Don't expect better low-end torque.  The Carrera S already has a variable intake tract to make max torque across the rev range (started 17 years ago in the 993 Varioram).

I expect better low end torque and better high end power from the X51 package. The whole point of the X51 intake system with the 6 switchable valves is to better handle the transition between different power and torque-optimised geometries. As you point out, VarioRam was once introduced to solve this transition, but had a different design using a second throttle body and a second plenum. Since then it has evolved into the more efficient X51 intake system with 6 valves. By the way, VarioRam was introduced 20 years ago on the 964 RS Smiley

Below is the torque and power curves for the 997.2 X51 package (solid lines) compared to the Carrera S (dotted lines). More low end torque and more high end power. Voila!

Screen Shot 2012-06-05 at 1.03.06 AM.png


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997.2 Carrera S in Carrara White. PASM-Sport Suspension (-20 mm), PSE.

987.1 Boxster S in Arctic Silver. OZ Racing Ultraleggera Wheels, H&R Monotube Coil-Over Suspension, H&R Anti-Roll Bars, Sachs Racing Clutch, Single-Mass Flywheel, IPD Plenum, GT3 Throttle Body, Recaro Pole Position Seats, PSE, Alpine Head Unit and Amplifier, Focal Speakers