katkens
Founding Illinios Chapter Leader-retired
I just ran across an independent test of OEM and after market air filters post on another forum. I thought I would post the link because it was very informative on the claims of various filter manufacturers. The testing was done on a Duramax but the brands used are what most of us are buying at the parts stores and folks that have changed to after market systems. www.duramax-diesel.com/spicer/index.htm I was surprised in some of the findings and thought it might be of interest....Ken