you you wrote:easyrider wrote:Exactly..Well said...In fact many car manufacturers will deny warranty claims if using a KN filter.
Which ones?
I dunno, My vehicle owners manual states it can void the warranty. I just think and agree that for a fractional amount of HP gain there are better ways and less riskier measures one should pursue. A fractional HP gain can result in poor engine performance and sensor contamination etc etc. possibly resulting in more deleterious issues down the road. See below service bulletin General Motors issued..
Bulletin No.: 04-07-30-013
Date: March 05, 2004
INFORMATION
Subject: Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light on as a Result of the Installation of an Aftermarket Reusable, Excessively Oiled Air Filter
Models: 2004 and Prior Cars and Light Duty Trucks
2003-2004 HUMMER H2 (2005 and beyond included in this as well)
The installation of an aftermarket reusable, oiled air filter may result in:
^ Service Engine Soon (SES) Light On
^ Transmission shift concerns, slipping and damaged clutch(es) or band(s)
^ Engine driveability concerns, poor acceleration from a stop, limited engine RPM range
The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur.
When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively oiled air filter. The MAF, GPS reading should be compared to a like vehicle with a OEM air box and filter under the same driving conditions to verify the concern.
Transmission or engine driveability concerns that are the result of the installation of an aftermarket reusable, excessively oiled air filter are not considered to be warrantable repair items.