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A good project to investigate and a common problem on 996/Boxster conversions.

Some observations while running regularly with 3.4L Boxster conversions and 987 Cay S 3.4L:

The 987 has a nice wide, fat torque curve which allows them to put down power early on corner exit. A 996 3.4L tends to have a more narrow torque curve requiring more shifting to stay in the sweet spot. I suspect a well tuned and displacement-matched intake and exhaust along with software remapping will fatten up the torque curve and make the most out of a 996 3.4L in the Boxster.

One problem that has been reported is sonic pulses from the valve train traveling back up the intake and actually fouling the MAF sensor readings. Does the intake require a helmholtz chamber to neutralize these pulses?