Yeah, on a WRX the MAF is actually bolted to the back of the air filter box. When you put in a CAI, you unbolt it and put it into the tube, which in theory is supposed to match the diameter of the stock tube in the airbox, but...
Also, some CAIs are intentionally larger to allow the MAF to read more air than the stock size can read, but it requires EM, and still can nevcer be fully calibrated perfectly.
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FWD is the new AWD
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