Not to bring up a old subject but witch is the best drop in filter for the 2009 5.7 ?
I see Trueflow, Amsoil and so on, for real should I just stick with the stk filter oh and as far as CAI I can not decide plust I do not want to give up any more gas milage from what I have read in several threads.
Thanks...

 

I have a K&N filter and did not notice a drop in mpg.

I also got an oil sample and did not have high silica levels. Meaning, the filter actually filtered.

 

The AEM dryflow from the previous years will fit the 09 and all you have to do is clean it and let it dry when servicing it (no oiling).

 

I vote for K&N. I've ran them in all my vehicles for years.

 

Best? The cheap Fram, Wix or Mopar filters. When they get dirty you change them.

 

From watching the trueflow demo, I would have to say that it is the best as far as filtering. They claim that an engine can only suck down so much air and that their product is more than sufficient. However, I also like the AEM because I read an article by an off road magazine praising the dryflow filter.

 

Well I found a Trueflow on Amazon for $33.00 plus free shipping, I guess I can not go wrong with that ?

 

Well I have a true flow filter now and once I get a UOA I should have a better idea if it's all they claim it to be for filtration. The only bad thing about oiled filters vs. paper is that oiled foam/gauze will just start dumping dirt when it gets too dirty. Paper on the other hand will just flow a lot less.

 

This is my UOA w/ an open element true flow foam filter on my intake. The silicon number is what you want to look at for dirt contamination and it is a little higher than universal averages, but still fine. The report can also be seen here http://www.bobistheoilguy.com/forums...94#Post1579494 along w/ comments from other members on the site. Judging from this report and some others w/ foam filters I think they filter well enough as long as they are properly maintained, the foam is thick enough (about an 1" thick), and they are 2 stage foam like the true flow.

 

Same here. I run it in all my off road and on road vehicles.