[SimonRoma]

Peligro mate you will get more INTAKE noise with K and N but not exhaust!!! BMC and K&N are both excellent in my opinion and experience, the only things I change on my bikes are air filter and exhaust to let them breathe better and to remove some weight (exhaust).

 

[SimonRoma]

Sayek the filters do cost that much BUT you never need to change them again, just remove, clean and relube and off you go!! They DO make the engine breathe better for sure.