twin filter setup?

[lukasbmw]

LOL at the smurf video.

As sick a a dual intake looks, your best bet is either a stock setup or a K*N cone with a shield.

The stock VS basic cone intake debate will go on forever, but I've noticed a nice gain in every car I've put a cone intake kit on...

However, no car needs two...well not unless your driving a 1991 850i with two AFM's...

[gstuning]

Filter size is related to air flow,
If you have the correct diameter intake pipes for propper air speed you can still have a incorrect filter size, but do see if the filter is a restriction you will have to do MAF and MAP readings with the filter on and off,
if there is a diffrence just get a bigger filter, and then re measure,