GrimmSpeed BRZ//FR-S Intake - Manual (Page 12)

15. Grab your intake tube and holding the end of the tube with the MAF flange, slide the
other end through the hole from the inside of the box, toward the throttle body
(figure 19). Slide the tube into the throttle body coupler but do not tighten.
16. Take the filter and its clamp out of their packaging and slip the filter into the airbox
(figure 20). There will be just enough room to get the filter onto the intake tube. DO
NOT TIGHTEN THE CLAMP YET.