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and what kind of gas mileage improvements or declines have you seen? Just curious since it's been out a couple weeks now.
 

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Emailed K & N about Part No: 33-2448‏; here's the response i got:


" Thank you for your interest in K&N products. We don’t have specific horsepower gains for our drop-in replacement air filters, but you will see an additional 1-4 horsepower with improved acceleration and throttle response. In terms of fuel economy, we cannot guarantee an increase in fuel economy resulting from the installation of one of K&N’s replacement high flow air filters or performance intake systems because there are so many variables that contribute to fuel economy - personal driving habits, vehicle maintenance, elevation, geographical factors (hills vs. flat ground), etc. Generally our customers do experience an increase in fuel economy because our filters and kits remove restrictions from the airflow pathway, but we cannot guarantee an increase in fuel economy.



If you have any further questions, please feel free to contact our customer service department at 1-800-858-3333 and we will be happy to assist you.





Sincerely,



Matt Smith

Product Specialist

K&N Engineering, Inc.

[email protected]

1-800-858-3333



The statement above is intended solely for the person(s) to whom it is addressed and is not to be publicized, republished, forwarded, copied or repeated without expressed permission from K&N Engineering, and only when done so in its entirety. If you are not a named recipient, you are also on notice of its status. If you receive this message in error, please notify the sender immediately by reply e-mail and then delete this message from your system. You must not disclose it to any other person, copy or distribute it or use it for any purpose. "
 

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Its been stated with a lot of testing that most likely you won't see any improvement in fuel economy or even power with a K&N drop in. Basic rule of thumb is that the more airflow that goes in, the more particles get in as well. Decent paper filters and oiled K&N filters do about the same job in keeping your car running. The gimmicky shows they have with KN filters having so much more airflow is usually due to it not being oiled enough or oiled at all. There might be a minuscule improvement, but its certainly not something you'll notice.

I have a K&N drop in mostly because I got the recharge kit for free from a friend, so I figured I'll just use it just so I keep recycling it. I haven't noticed any change myself and really didn't expect any. I plan on dropping in the original filter whenever I clean my K&N one.
 

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QUOTE (ijoe @ Sep 15 2010, 12:37 PM) index.php?act=findpost&pid=356447
Its been stated with a lot of testing that most likely you won't see any improvement in fuel economy or even power with a K&N drop in. Basic rule of thumb is that the more airflow that goes in, the more particles get in as well. Decent paper filters and oiled K&N filters do about the same job in keeping your car running. The gimmicky shows they have with KN filters having so much more airflow is usually due to it not being oiled enough or oiled at all. There might be a minuscule improvement, but its certainly not something you'll notice.

I have a K&N drop in mostly because I got the recharge kit for free from a friend, so I figured I'll just use it just so I keep recycling it. I haven't noticed any change myself and really didn't expect any. I plan on dropping in the original filter whenever I clean my K&N one.

its not really so much air flow, its just less restriction than a regular paper or cotton air filter. and its actually less efficient in stopping particles if you want to get technical. but we are of course only talking microns at this point. :grin:

the most noticeable thing you will get from a K&N drop in would be the tone of the intake changing.
 

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less restriction *is* more airflow. In addition to passing more air, and therefore more dirt, the oil on K&Ns can foul the MAF sensor which is easily a $400 item. When the service people see the oil on the sensor, reach for the checkbook as they will surely deny any warranty claim. And forget about any warranty claims for a dead engine as well. Micron-sized particles can build up, and with extremely tight tolerances on high-efficiency motors they have now, dirt of any size is the last thing you want passing into the engine.
 

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Yeah, I bought a K&N drop in for my old Dodge Caravan a few years back. There was no change whatsoever in MPG. Been buying paper ever since.
 
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