I just saw a Youtube video done by two Australian's that ran; stock air box, cone filter, CAI box, no air box at all and one they made that was unusable on the the street. All of the air boxes showed poorer or equal at best performance on the dyno than the stock air box. It was a very interesting video. I know we all do this, all my previous Camaros and Vette it was the first thing I did, and an engine is just an air pump more in and more out makes more power. Have seen all the ads showing dyno results but has anyone actually seen results with just a CAI change?
If you're talking about the video I think you're talking about then I would pay those two idiots absolutely no mind. Those guys were complete numbskulls and had no idea what they're talking about. If I remember correctly they rigged up an intake that looked like crap, their testing methods were impractical, they spent the whole video acting like fools, and their testing site was complete BS. Even the vehicle they used was a complete joke. Even if their test was accurate, able to be duplicated, and credible, you still can't draw the conclusion they drew as applicable to every vehicle.
Intakes have been tested for decades. They've been proven to work time and time again. There has been testing from manufacturers, magazines, and third parties that have all proven the same thing. And even those who don't use dynos have proven results at the track. I'll admit that the manufacturers always exaggerate the gains for marketing purposes. However the actual results speak for themselves. Vehicle manufacturers fashion the intakes for specific reasons. Engine noise control, emissions, fuel economy, filtering harmful debris, etc are all factored in. Aftermarket companies make intakes specifically for improving performance. A proper cold air intake will outperform a stock intake in almost all cases.
Here is something I posted on another forum that might be of interest here. Only IAT and MAP data, not HP, but might still interest some of you.
Below is a PDF file of some IAT Data I collected with a Cold Air Inductions intake and a Vararam Tune Model intake at the drag strip. Nothing fancy or scientific about the methodology, I just used the Ambient T, RH and Barometric P from the track's weather observations posted on Drag Times. The IAT numbers were retrieved from the car's ECM with EFILive data logs that I collected during my runs. No system in place as far time between runs, cool down strategy (hood open, hood closed, etc.), haphazard is the best way to describe it. This is raw data and I will not attempt to influence you with my conclusions. You'll have to look at the data and draw your own conclusions. Again, totally unscientific in methodology.
The other night I datalogged. It was like 68 degrees F and my IATs stayed consistently at ambient to 3-5 degrees F warmer than ambient while the car was moving at 50 mph. While stopped for a few minutes they crept up to 90 degrees F but went right back to ambient once I started moving again! I have Vararam tune model.