the race filter filters less. allows more air flow but also more dirt. not recommended for a street bike
K&N actually flows better than BMC. BMC is just barely better flowing than a stock paper filter. but here again it's a compromise. you can't have both a super well flowing filter that captures dirt well.
oiled filters capture more dirt because of the oil. the filter media in a bmc and K&N is actually very shitty for filtering anything. but it flows good.
I would go with either the bmc or K&N over stock only because it's reusable and will save you several hundreds of dollars over the lifetime of the bike.
I ran a BMC in my R6 for many years and about 16k miles. the air box under the filter was very clean every time I cleaned the filter.
Last edited by yamaharandy; 04-16-2017 at 03:05 PM.