Testing a 'performance' air filter for MPG - Part 2 - MetroMPG.com
Planet Soarer: Panel Filter Test
K&N Air Filter Review - Debunking the Myths (and why OEM is better)
K&N air filter - Destroy your motor - Harley Davidson Forums
BMC High Performance Air Filters
ITG Filter Deterioration - North American Motoring
Performance Car Air Filter Test | Fast Car
K&N Air Filter Review - Debunking the Myths (and why OEM is better)
Air Filter Shootout Test - Results! - MitsuStyle
K&N Air Filter MPG test - Destinations Anonymous
Performance Car Air Filter Test | Fast Car
K&N Air Filter MPG test - Destinations Anonymous
Air Filter and Cleaner Modifications - Forum
DNA Test and Results
K&N Air Filter Review - Debunking the Myths (and why OEM is better)
Auto Air Filter and Intake Systems
K&N Air Filter Review - Debunking the Myths (and why OEM is better)
Air Filter Test Data - KNFilters.com
K&N Response to Mass Air Flow Sensor Concerns
So Clean Air Filters Don't Help Fuel Mileage? - 1A Auto
ISO 5011 Duramax Air Filter Test Report
Are K&N filters bad for engines by depositing their oil into the intake? - Quora
ISO 5011 Duramax Air Filter Test Report
Comparative Tests on Pressure Drop of HVAC Filters - Tex-Air Filters
