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No parts missing. You will need a small bolt (I believe 10mm) for the top mount. I was using it without the bolt and it is fine like that also.
You will need to transfer the mas air sensor from your original intake to this intake (very easy two bolts supplied by Fabspeed). This is how it is when you buy new from Fabspeed.
I did not buy the intake, the previous owner added to the car and drove 1k before trading the car in to Porsche Rusnak Pasadena for a 997 turbo.