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Thanks! I took mine out today and was contemplating what options I had... glad to see K&N has something at least.
 

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I have installed the K&N air filter and I see an increase in gas mileage. Before the change I would see 48-49 MPG on my drive to work. Since the change I see 52-54 MPG. It must be making more power, but I could not quantify how much more. It probably accelerates quicker, but is still not quick. I had an '07 MAZDASPEED 3 before the iA so it seems very slow to me.
 

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May also see an increase in throttle response. I doubt that it would give you any noticeable power itself but it'll could definitely help efficiency wise to give you that better mpg
 

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I just bought mine and it should be coming in the mail tomorrow. I get about 28-34mpg in city/rural driving with tons of stops, so any more mileage would help, and I am hoping for at least 1 more HP lol. I will let you know my thoughts once I drop it in.
 

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K and N strikes me as a bad idea. I would stick to OEM specs and the manufacturer's recommendations.

Earlier in life, I used to call on garages and fleets to sell a different brand of aftermarket filters - one that was known for better dirt retention and at the cost of reduced flow, sort of an opposite to K and N.

Here are 2 items:

1) Critical review of K and N at the amazon site - https://www.amazon.com/33-2129-High-Performance-Replacement-Filter/dp/B0000UUX34

Quote: "I am professional mechanic with over 40 years experience and I can not tell you how many times I have seen excessive dirt in engine intakes only to find a K&N installed instead of a real filter. Sure they flow slightly better but how do you think they do that? Hold one up to a bright light sometime and see how much light comes through those big holes...At a Bosch service school onetime the discussion went to mass air flow failures and K&N filters were mentioned. The instructor said that the K and N stand for "kill it now"

2) In-depth comparison of K and N and other brands from a Nissan owners site. if you like charts, this is for you. http://www.nicoclub.com/archives/kn-vs-oem-filter.html
 
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