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@Dammit
X51 intake is the complete/ black&silver one, below it is the centre section from a 997 GT3 RS:
It's got multiple actuators:
Which open and close to modify the Helmholtz performance of the intake:
This plenum was used on the 997 GT3 RS, 3.6l, 3.8l, and 4l. So on cars producing from 415hp to 493hp.