POTAUTO MAP 4006C (CF10362) Activated Carbon Car Cabin Air Filter Replacement for BMW, 300 Series, M Series, X3 Spec.: 25.98" (Length), 3.74" (Width), 0.98" (Height); Four-layer fabric (One Carbon Layer) ; Installation instructions included. Applications Where Used: BMW (318i 1999, 318is 1999, 318ti 1999, 320i 92-05, 323Ci 2000, 323i 99-00, 323is 1999, 325Ci 01-06, 325i 01-05, 325xi 01-05, 328Ci 2000, 328i 99-00, 328is 1999, 330Ci 01-05, 330i 01-05, 330xi 01-05, M3 1999,01-06, X3 04-10) (See Amazon Part Finder for fitments to your cars) Benefits: (1) Reducing at least 98% of these contaminants (Dust, Pollen, Exhaust Gas, Particles of 5-100 microns...etc.) from the air passing through the filter & entering the interior of the vehicle. (2) Activated carbon cabin filter provide extra protection by absorbingthe airborne agents & allergens. (3) Increase safety through reduced deposits in the fan or on the windscreen, and protect HVAC air conditioning performance. Competitor Cross Reference Part Numbers (for reference only, please check size): BECK/ARNLEY 042-2034, BMW 64 3 19 071 935, BMW 64 31 9 071 935,BOSCH P3640, G K INDUSTRIES CF1068, HASTINGS AFC1478, KLEENER CAF1721, CAF7721, NAPA 4473, PRONTO PC-5510, PUROLATOR C15510, STP CAF1721, CAF7721, WIX 24673, 64319216590, BM99131C, CAF80C, 64319257504, 81906001, 800010C, Ecogard XC15510C, Luber-finer CAF7721, MANN CUK6724, FRAM CF10362 *** Change filter every 12 months or 12, 000-15, 000 miles. Check & replace filter if peculiar smell / odors emit from the cabin air outlets, or if the vehicle HVAC system operates with poor performance, or humming, or weak air volume. ***LEGAL DISCLAIMER: The Brand name & Model # (if listed) are for cross reference only. All Brands, Trademarks & Model Numbers remain the property of their respective owners.