Found a post from Loren on the Internet regarding the 996 X51 package, which was compiled from a Tech Bulletin:
Quote:
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).
The higher-performance engine is also available as an option when ordering a new vehicles - 911 Carrera / 911 Carrera 4 /911 Carrera 4S /911 Targa - under Exclusive Option X51."
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