Originally Posted By: wemay
Originally Posted By: tony1679
Nice to see another local join. Fwiw, I have asked this before and ran into many dead ends. Below is a link to my thread. Maybe it will answer a question or two. I ended up using a Wix, and it's holding up great.
Air Filter Efficiency
This 'test' is relevant if his vehicle is a Duramax diesel from 2009 or earlier. Eveything else is opinion and supposition. But in this case, yes K&N came in last place with a 96.8% vs 99.9% efficiency rating vs the AC Delco in this diesel.
My point isn't to say that K&N filters best, just that once the internet gets a hold of any data, however gathered, the readers extrapolate the information into a witch hunt.
To the OP, If efficiency is what you're looking for, try any of the OEM cellulose style top name brand filters on the market. I doubt you'll encounter an issue with any of them.
Is stp considered a top name brand? Seems to be a fram duplicate just black instead of orange from what I can tell?