[texascanuk]

Changing my OEM air filter and got alot of flack on FB over the nasty pic of it. I was shocked when I pulled it out too but I rely on the vacuum filter minder to tell me when the filter is starting to restrict flow. The filter minder was in the middle of the green range at this change and only recently got there after a few full load uphill climbs with the holiday trailer. I researched a bit this morning and found a bit of info to share. The OEM filter is large...3 in deep and big dimensions so there is alot of surface area. This could be why the filter minder did not show much restriction even though the filter was dirty on the front face the pleats were only moderately dirty. The OEM flows 670CFM at less than 0.5psi. The 5.9L turbo diesel consumes 563CFM at 1800 rpm at my cruise speed and 780CFM at 2500rpm. Knowing this, I would expect the stock filter to easily keep up to demand and negate any perceived benefit from an aftermarket "cold air" intake which is not getting colder air than OEM because they both draw from the fender area.

If you want to check your own numbers go to https://www.widman.biz/English/Calculators/CFM.html

 

[smelonas]

If the filter minder moves at all, it's time for a new filter..

Dont buy a cold air intake, just not worth the dough.



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[steve05ram360]

If the filter minder moves at all, it's time for a new filter..

Dont buy a cold air intake, just not worth the dough.



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I have been tempted to throw my afe kit back in there and see what i can do with it... Its the one with the PG7 filter with the 6" base...

 

[smelonas]

It's not worth it to buy one was the point of that statement. If one already has a filter kit, to hell with it all and just use it. As long as it's not KandN... lol

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[tryNto]

I had a CAI on my Truck for years, Went back to OEM and picked up 1+ mpg.

 

[BigmanT773]

Not worth the money. Modify the OEM box if you feel like you need more air flow, lots of write ups on here on how to do it.

Wait until you get a set of compounds that basically come with the cold air intake.

 

[idaho_3500HO]

I have found those filter minders to be useless. I just check it periodically and replace as needed. Like you have found, If the filter minder indicates a need to change it then the filter is very dirty.

 

[RamThisCummins]

I am running the stock air box with an airaid filter in the stock location with a taterbuilt 67/67 turbo.

 

[Baja]

I went from my AFE back to stock. Zero difference in performance or mileage, but MUCH quieter in the cab.

 

[Grogg]

I go by the filter minder, seems to work great for me.

@OP: thanks for the pull, pic n' post!