K&N's filters are generally less restrictive than stock ones. However, its always a toss up of viltration over performance. The K&N's lean more toward the performance.
06' BMW 330i & 03' Suzuki GSX-R600
SG | Beige Dakota | Poplar || iDrive w/MP3 | PP | SP | CWP | PDC | Comfort | Shades || 40% Tint | Black Line Tail Lights | Hardwired V1