Intake\Filter Question

Hello, I installed an APC air intake on my Accord about 2 weeks ago. I have noticed that it sounds really cool, but I do not notice much of an increase in HP or Miles Per Gallon. I was going to purchase a K&N filter for my intake, will this make a differance? Will I notice any better HP or Miles Per Gallon if I replace my APC filter with a K&N RR-3001 (See Web Link....)

http://www.knfilters.com/univcustcap.htm (the ones at the bottom of the screen)

Thanks for your help!

sorry bro but a filter isnt gonna do much for ya. your intake is still gonna be sitting in the engine bay breathing in nice hot air thats totaly doing the opposite of what its supposed to. regardless even a cold air intake isnt gonna give you enough to feel in theory.

What am I better off doing? Keeping it the way I have it (APC Intake and Filter)? Putting the stock intake "box" back on with a K&N Filter? Keeping APC intake with K&N Filter? What is best for the car?