BMC Air Filter vs Stock in 919
I had back to back dyno runs done today at Redline in Calgary to compare BMC to OEM Honda Air Filters. The BMC makes a touch more power. It does NOT make a bunch of more power. Very interesting though, was a slight loss of torque below 5200. From 5200 up there was a bit more torque. So, my BMC does exactly what I wanted all along. I have a life time filter that actually gives a tiny bit more in the zone I'm interested in. The same likely holds true for a K&N as compared to a BMC. Bike is a 2005 with PCIII, Yosh TRCs, custom map.
There are bikes that do get messed up with non OEM filters, but the 919 is not one of them.