Are K&N Air Filters Worth It? By KNF
Senior Member
Joined: Nov 2008
Posts: 314
Likes: 0
From: michigan
I have heard that the K&N panel filters can disrupt the laminar air flow across the MAF sensor. When this happens, there will be a lean condition due to the MAF measurement being thrown off, not due to additional air flow. This would explain the "bogging down" you experienced. With the K&N FIPKI, there will be a lean condition due to the air velocity being decreased across the MAF sensor because of the increased diameter intake tube. Again, the lean condition is due to a MAF air flow measurement problem, not due to more air flow.
every FIPK ive done on my vehicles you use the stock MAF it doesnt come with a bigger bore MAF so how does the air velocity decrease across it im not sure about the 5.0l motors but the reasons you cant run the FIPK in an 09 and up model is the reason they are 3v motors and pull in alot more air, so when you add the FIPK to them and let them take in all the air they need the MAF registers that air BUT the computer does not have the capabilities to richen the fuel mixture enough to not throw a lean code
that is just what i have read on this forum in doing research when i wanted the K&N for my new truck
Senior Member
Joined: Dec 2011
Posts: 443
Likes: 0
From: Durham, NC
every FIPK ive done on my vehicles you use the stock MAF it doesnt come with a bigger bore MAF so how does the air velocity decrease across it im not sure about the 5.0l motors but the reasons you cant run the FIPK in an 09 and up model is the reason they are 3v motors and pull in alot more air, so when you add the FIPK to them and let them take in all the air they need the MAF registers that air BUT the computer does not have the capabilities to richen the fuel mixture enough to not throw a lean code
that is just what i have read on this forum in doing research when i wanted the K&N for my new truck
The OEM setup will flow way more air than the 5.4L 3V can pull"
