GrimmSpeed BRZ//FR-S Intake - Manual (Page 7)

9. Using a phillips screwdriver, remove the MAF sensor from the stock intake (figure
10). You’ll want to reinstall the stock screws into the stock MAF housing, in case you
need them in the future. Using the included machine screws and a 3mm allen
wrench, install the MAF into the GrimmSpeed intake tube (figure 11). Lubricate the
o-ring before installation. A little bit of water/soap/oil/saliva will do. Tighten until
snug.