Personal opinion is that you'd make that same type power gain from putting a performance filter in the standard box and tuning it.... 10-20kw atw is bullspit unless you completely remap the ECU with more boost etc, plus on late model car's you may find that the ECU will start to compensate if you allow too much airflow and thus give you no gain for your investment... Many people assume their car gets faster with a CAI due to it being noisier (and it does sound good) however there are limited gains in a late model vehicle from fitting additional or aftermarket parts and not tuning the ECU to suit.

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Cheers Rob,
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