Just received an email from Arlen Ness tech support, and they sent me the flow numbers for their air cleaners.
Stage 1 Big Sucker - 200CFM
Stage 2 Big Sucker - 250CFM
On another forum, someone posted the numbers they received from K&N about their air cleaners.
E-3014 = 248 CFM RK-3009 kit
E-3037 = 301 CFM RK-3910 kit
HD-0800 = 231 CFM SE replacement
This is what I got from Ness Tech Support - may be right, may be wrong. Now I'm just confused...
"Hi Bill,
We had an independent lab do the flow testing, the 251.44cfm is for the Stage Iā
Here are the numbers for air flow on the two air filters. These numbers are based on 28ā water using the factory carburetor. Please let me know if you have any questions.
880-112-1 air flow 251.44cfm
880-113-1 air flow 255.26cfm
Both numbers are SAE corrected and you may notice there is only a small difference between the two. This is due to the carburetor being the limiting factor in total air flow. However, the 880-113-1 filter does provide additional dirt holding capacity. This allows the larger air filter to flow more air than the smaller one as it loads up with dirt.
Hope this helps,
Danny