The main draws of aftermarket filters, are their reusability, and their better-than-stock air flow. Where they differ, and where it counts, is in how well they hold up to repeated cleanings, and how well they still manage to filter, while retaining those higher flow numbers. Some other brands (even the biggest brands around) just can't handle the repeated in-and-out process required for maintenance, as well as the repeated cleanings. I've seen big brands have their glue fail, elements puncture, and gaskets just stop sealing. I've also seen the "t-shirt test" results for those other filters, and it made me cringe to see how much debris made it past the filter that I'm relying on to protect my engine. OEM filters are fantastic at stopping dirt, dust, and even ash from getting into your cylinders. Some major brands of aftermarket "high-performance" filters get their improved airflow by *not* filtering these fine particles. With BMC, I have not had a single gasket fail to seal the box. I've never had the glue fail after repeated washings, because most BMC filters are not glued - they are moulded into a single piece. I've also seen the "t-shirt test" results that show BMC filtering equally-well to the OEM filters, while still offering much higher airflow than stock. BMC is in every bike I've got, and will remain so until I see a reason to change.
BMC Air Filter
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I have a bmw r1100rs and it had a k&n filter which had never been cleaned it was black instead of red, when I was buying a new filter I thought I'd give bmc filter a try over k&n and it seems a little better made
This filter allows for better airflow and you can hear the difference from your airbox. Without a doubt BMC is the filter to run. My 2008 VFR800 had a major flat spot around 5k. With this filter and a few free mods while I was in the airbox those issues are no more.