I talked to K&N and aFe today and you can find just about any number you want. K&N told me their in the OEM box turbo diesel filter which is sort of the cone/deep filter will flow over 2000 cfm! After I got up from the floor he then said BUT with it and the box you will only get up to about 700 cfm. This is suppose to flow about 50% more then OEM but I've always heard that K&N sometimes has some filtration problems. I asked about that and got a big time "guess". Something about between 96% and 99%. We all need to realize that the more dirt that is blocked the less air that can flow and visa versa.

aFe told me that when it's all said and done, really their stage 1 EZ setup with the 7 layer filter will flow all the air a stock to a moderatly modified engine can use. I do have to agree with most here, this is a big time seat of the pants thing although it still is fun and can help a little. Bottom line is it's easy to really get more money spent then you will get in return and more air flowing in then you can get flowing out.

All of that being said, I think most of us, well me for sure, will go ahead and get some sort of intake and tell others how great it is!!! As for me, I decided to go with the aFe 7 layer filter and the stage 1 setup because I already have their turbo boost tube and living in dusty NM need all the filtration I can get on our nice calm spring 35 mph dust blowing days!

 

Hey 21 ... even though HOV gave us some hints on the test data from the TDR test, if you could post up sometime soon, I'd really appreciate it ... thx!!!

 

The December 2007 issue of "Diesel Power" does a "Deep Breathing Upgrade" (starting on page 70) on a 2008 Ford Super Duty with the 6.4L motor.

In this article, they add a n AirAid 'cold-air' intake on the Ford.


First, they tested the kit with the top of the filter exposed, which resulted in 1,185 CFM.

They then topped the kit off with a steel plate (to stimulate the hood being closed), which resulted in 1,065 CFM.

From published data, the 6.4L motor needs 744 CFM for the motor to make full power.

So, even a less than decent kit like AirAid flows more than the stock motor will ever need. I think it just comes down to how well you want the filter to catch dirt........

Does anyone know the the CFM ratings for the Cummins motor?

 

D45, very interesting info and I guess it does sound like most filters will flow enough for a stock motor, slightly modified too I would imagine. Guess if it's about getting the flow up there but keeping the dirt out I'm glad I went with the 7 layer aFe.

I don't know on the Cummins but it's something I'm gonna take a look into.

 

Sorry bout that bud, I totally forgot I had duty so I havent been able to go home yet. I will post it when I get home later today.

 

Also, if you look at the S&B Intake ads in the January 2008 issue of Diesel Power magazine, it states this:

2003-2006 Cummins 5.9L

Part Number 75-5033

Air Flow Rating: 43.0% Better Than Stock

Efficiency Rating: 99.16%

Testing Conducted at Vehicle's Max Rated Flow: 526 CFM

---------------------------------------------------------------

SO, I assume that maybe this means the CTD needs 526 CFM for the motor to make full power...........

Ford's 6.4L motor needs 744 CFM for the motor to make full power, possibly because it is a twin turbo motor???

----------------------------------------------------------------

So, would this mean that the S&B Intakes flows about 752 CFM?

 

D45, thanks for the numbers ... so, if we're to work with those assumptions, then this setup from a fellow DTR member would flow around 1052 cfm. It also uses the stock filters for cheap replacements.

http://www.lazarsmith.com/SuperBHAF.html

 

da :bump: da

 

I emailed K&N, concerning their 57-1532 Kit:

"Thank you for your interest in K&N products. That filter will flow at
1063 CFM. If you have any further question please call our Customer
Support Team at 1(800)858-3333 and an agent will be happy to assist
you.
Thank you for writing and have a great day.
Sherri Sykes
Customer Service Agent "


The filter that comes with their kit is P/N RC-4780

Amsoil offers a direct fit replacement filter for this kit: EAAU-4095

 

I put an Airraid dropin on my stock 05 and after destroying the filter after 8000 miles, I went with Amsoil and havent looked back.
There is a pic of the Airraid in my gallery.

 

i put a afe stage 2 dry floy on my truck and i realy like it i live in arkansas and about 90% of the county roads r gravel before the yellow air flow button was always puled down with the afe it is never down and all i have 2 do is wash it and let it dry