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Alisdair Cusick explains how the X51 Powerkit extracted more from the 911’s nat-asp flat six For some owners, standard is never enough – even on a 911. With this in mind, Porsche offered a performance increase package for the 911 called the X51 Powerkit. Since the 993, the X51 was a factory-approved package to give a 911 engine a little bit extra. The X51 floated around on options lists for both the 993 and 996, but you may not have known this, so uncommonly was the option specified.