Air filter

[HAYABUSA1340]

i agree with what you said

 

[fadiizzaldin]

I did a back to back test between OEM, K&N Street and BMC Race and the best was the BMC, K&N dropped a bit on hight range RPM (the stock was better!) although K&N gave a bit of improvment on the very low end. BMC Race was good all the way... I'm now running BMC Race