I don't think that is the case. He was getting 20 hp more with the R2Cs on. Maybe they aren't responsible for all that gain but they certainly didn't lose anything.

I have no reason to believe that the R2C lose power. I tested it again today, and the intake temps are the same as with the stock intakes while in motion, the filters are twice the size of the stock (if not more), and the pipes are smoother that the stock hoses. It also runs a tad leaner on the R2Cs. I did a few 0-60 runs today and for the first time (after the Cobb tune and with the R2Cs on) I chirped the tires in 2nd gear (with A/T) - never happened to me before, so maybe I did add a few HP, who knows.

I did say the same or less and Im sure they werent responsible for 20 HP gains.

Yea the big filters probably dont need to be that big, the car can only suck in so much air regardless how big the filters are, I did an air intaake reading on my Cobb and was getting like 400 GS at WOT and I dont think the car can suck in any more than that and the K&N filters can flow way more than that. The Cobb tune should have fixed your AF so its not too lean.

:iagree: BTW, how do you run an airflow test on the Cobb? I do not recall that being one of the tests you can run, but I'm sure I could be wrong.