The engine has wide parameters programmed into the computer to compensate for additonal air flow. Remember that the computer is reading all of it's sensors to try to achieve a perfect AF ratio, mainly for smog purposes, but an incidental side benefit is that and efficient engine is also producing good power. Sticking anything int he path of the airflow will restrict it, even though it is just a silecer. take a straw and suck though it. Then stick a pipe cleaner in it and suck again. You will feel the difference. Then replace the straw with a larger straw. You will get more air. Pretty basic there. It would be an interesting exercise to acutally measure CFM demanded by the turbo at different RMP's and see how much the various solutions acutally deliver. Then you get into porting intake manifolds and heads but as a general rule the things manufaturers do to just the air delivery systems to keep them quite will restrict flow and rob horsepower. Those silencers are obstructions in the smooth delivery of air.
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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