GrimmSpeed BRZ//FR-S Intake - Manual (Page 3)

4. Remove the three 10mm bolts securing the factory airbox to the chassis (figure 2).
Keep track of these, as we’ll reuse two of them during installation of the
GrimmSpeed air box.
5. Release the MAF sensor harness from the MAF sensor (figure 3). Also release the
small clip securing the harness wire to the airbox (figure 4).