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Originally Posted by JFP in PA
The manifold and adaptor would end up being too tall; 911's have taller engine bays than the Boxster.
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Yes, so you would have to lower the motor by 1-2". Also there is a lot more to a 996X51 than just the intake manifold. Here is the list:
X51 Power Kit
(from the tech bulletin describing installation)
"A parts set -"Carrera Powerkit"- is available to retrofit the standard engine with an increased performance of 254 kW (345 HP). The following parts in the engine are replaced, exchanged or modified to achieve this increased performance:
- new intake manifold with modified cross-section (material: sand cast aluminum );
- new intake pipe supports adapted to the form of the intake manifold;
- new exhaust manifolds with larger cross-section and optimized flow behavior;
- new cylinder heads with optimized, CNC-milled inlet ducts;
- new camshafts with larger valve stroke on the inlet side and modified inlet and outlet timing;
- inlet valve springs adapted to the enlarged valve stroke;
- modified partition box in the oil pan;
- modified maps for the DME control module.
The following steps are also taken on the vehicle:
- new underside panel in the transmission area;
- additional radiator in connection with modified front spoiler, except on the 911 Carrera 4S (996).
My guess is that if you added the X51manifold to a 3.2L without all the other changes you would possibly gain a few ponies at the top of your rev range and sacrifice some midrange torque. It might be a bit faster 0-60 but slower on a road course where torque is king. Essentially just moving the powerband around.