The k&n put down 1.5hp more but i'm tuned for it. The bmc was leaner through 6-8k rpm. With tuning I would say the two would be about the same. To really tell i would have had to tune for the bmc which i didn't feel was worth the money. The a/f was really off between the two. I did like how the bmc housing was hard like the oem filter, it made it much easier to seat right. The k&n is soft and flimsy.
For reference my bike:
2000 CBR 929
Factory Pro velocity stacks
full Sato titanium exhaust
power commander II with custom tune
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