sorry I may be wrong about stuffing turbos - people have told me that before thats all - but read this - quoted
Once upon a time they were used to replace stock airboxs and air filters as these were a restriction in the intake,with modern design and processes,the restriction is less in the stock item,so replacing it with a pod filter has become less of a performance gain and more of a "bling" factor,there is also a few other downsides to fitting of a pod filter,one being as mentioned vibration,and the damage it causes to your airflow metre,also if the pod in an oiled design,this has detrimental effect on the airflow metre if it is of hot-wire design, and lastly heat the original air box gets cold air routed to it from outside of the engine bay,so with out encapsulating the pod filter in a cold air box and running a cold air intake,you will end up sucking warmer air which will be detrimental to your performance