Hey, i dont know much about cars but i do know subaru engines are more confusing than the norm. I am trying to put a cold air intake on my subaru legacy. I bought a K&N apollo air filter but now im not sure if the i should remove the air filter already on the engine because i think the MAP sensor is attached to the stock filter. if i cant remove the current air filter then theres not much point in having two air filters so i'll send back the K&N apollo and just make some homemade cold air intake piping to replace the air box. just looking for advice on whether or not i can remove the stock filter and if everything will work out, thanks