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If the car is MOVING, there is no real difference on where you put the filter. Makes a difference only after the car has stopped.
The real difference is the length and volume of the tube. Changing those parameters will change the tuning effect it adds at different RPM's. A well designed intake can greatly increase the volumetric efficiency. Although, this is much less pronounced on a turbo motor.
FI cars can actually have volumetric efficiencies above 110% due to finely tuned intakes. The charge entering the intake is actually 10% above atmospheric pressure. Very cool stuff.
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