The 996 3.6L X51 package was typically found on the ""40th Anniversary"" limited edition cars (MY 2004) but could also be special ordered by performance minded customers. The X51 engine package was blessed with many wonderful internal performance upgrades but Porsche still utilized the factory air distributor opening the door for the IPD Plenum to provide even more additional power. The X51 Plenum is a direct bolt on replacement and installation is relatively straight forward for mechanically inclined DIY customers although IPD strongly recommends all Plenum installations be performed by a trained and qualified Porsche technician.
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