And DO NOT, repeat DO NOT, drop your two tiny MAF sensor retaining screws into the MAF housing / turbo intake pipe; it's not so bad in stock setup as you can undo the rubber concertina intake pipe, but if you have some of the alloy or SS CAI's and CAI_FMIC setups, the screws can disappear real fast, even rolling close to or into the turbo intake, requiring a complete and careful dismantling to retrieve. As soon as your MAF sensor is out, carefully stuff a clean rag into the housing hole, shaking and inspecting the cloth to make sure there is no dirt, blobs of hardened glue or other parts entrained in the folds, or better, tape it over with good strong cloth reinforced gaffer tape that doesn't fall into pieces while you're off cleaning the sensor, or tinkering with other stuff. Then make sure you get it all back before refitting the MAF. Swallowing any hard metal bit or even a leaf or small twig that blows off the trees in your yard, or insect, can be a real headache.
You are a surgeon operating on the lungs of your car! Be hygienic!
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18