GrimmSpeed 08+ WRX/STi AOS - Manual (Page 4)

6. Install 5/8 x 1/2" connector into driver side 5/8" head hose that was removed in step 4. Cut
2" of 1/2" hose and connect it to the connector. Then install 1/2" x 1/2" x 1/2" tee (1) into the
1/2" hose. Install 1/2" hose (2) into the tee. Route this 1/2" hose to the right side fitting of
the AOS. Cut the 1/2" hose and push it onto the AOS right fitting. Note that on 2012 vehicles,
there may be a white plastic flow sensor in the system, just after the valve cover. It should be
left in the system. You can connect the hose going to the tee directly to the sensor.
7. On the passenger side of the engine bay near the turbo, locate the other end of the plastic
cylinder head crossover tube. Disconnect the head vent hose from this tube.
8. Install 5/8" cap on the plastic tube.
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