[beepbeep]

Original 930 box is ugly, but it's well designed and flows pretty well. Best of all, it inhales cool air beacuse of it's placement.

I wouldn't recomend replacing it with something else. As Rarly mentioned, you could add a few HP on a engine that has 300+.

Also, i wouldn't trade those few pesky HP's for more dust particles in the engine (which unfortunately seems to be common thing with "sport air-filter". I'll try to dig out URL to article where one BMW guy explains how people often put on "sport" -filters that actually draw in more hot air and inhale lot's of particles.

My 5c.

P.S.
If you really want good flow, get rid of CIS, use MAP-sensor equipped ECU and install huge open-air filter directly onto turbo-intake...then we are talking serious horsepower!