here are a few notes from others as i went through the intake design process:
tholyoak
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Keep in mind that the positioning of the MAF sensor in the intake track relative to the throttle body and the air filter is as important for MAF voltage to air mass calibration as the the diameter of the housing the sensor is placed in. The 5.2.2 DME cars are extremely sensitive to this.
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blue2000s
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Flow speed is irregular through a tube, fastest at the center fully developed, 0 at the walls. If the sensor is near a bend, diameter change or near a filter, it will be irregular (not the nice, parabolic velocity profile) and need to be tuned.
......it has to match the 996. If they dialed it in near a bend or filter, you have to do the same thing. And be in the same relative location to the bend with regards to the circumference of the tube. So it's not a matter of you picking a good spot to start from, it's you having to pick the same spot that the ECU expects.
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