Guys,
this has been done to death. At the time I made these measurements, only a few folks had home-made any CAI's and many were running HAI's exactly like MrMiata's and I just wanted to share my experiment and the way I went when I made mine. As I stated earlier-I first had exactly the same setup as MM's after I first installed K&N's in the OEM. I didn't buy the K&N's just for the experiment!

My present system is dual only because I had the $$ and it looks cool.

As for using the folmulae presented by our friend from Guam, that's just fine, but the only (IMHO) way to get a true comparison is the way K&N and other manufacturers (like Eurocharged) do:

put it on a flow table.

K&N Airflow Testing Procedure