Thought this was already asked?
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Originally Posted by Ricker500
Hi Guys;
I was told that if I replaced my stock air filter with a K&N filter I would get better air flow to the engine. I have a 2003 Grand Am GT1 with a 3400 engine. What I was wondering if I get more air flow will this not screw up my computer settings or is there not enough difference to affect it.
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Welcome to AF!
Having owned, and still own my drop-in K&N filter lol
It helps out a little bit with air flow, you get better gas mileage due to more flow to the engine, then again it also makes the ratio of gas mileage in a more wider band if that makes sense
basically, if you're a light foot with your grand am, and you have the drop-in K&N, it helps a great deal with with mileage
if you like to get up and go, you'll notice a slight improvement in speed, and a little bit more growl to the engine. But in all respect, having a heavy foot will affect how good the mileage is... in most cases it'll go down a little under heavy driving
Putting in a K&N filter will not screw up the computer settings, You will be getting better flow of air to the engine, hence the computer will correct it (the ratio)... the PCM will be sending more fuel to be burned to keep the balance of air/fuel in your engine.
With a drop-in you will also still pass emissions if you're worried about that.
All in all, the changes are slight... but noticeable. If you drive easy, your mileage will improve a little bit... if you drive your grand am hard, again the mileage will go down, and you'll get a more slightly louder growl sound to the engine.
Hope all this info helps
Normally the price of a K&N drop-in is around $50 I do believe, but I could be wrong
Oh yea, and the best part... You'll Never have to buy another filter again! ... and they're easy to clean and maintain
188fwhp and climbing! 
