Pro tip from a guy who ran a Dyno shop for a few years....
Intakes (when designed properly) absolutely DO work. DO make power. MAY increase mileage.
Dyno results can be tricky. When you first install an intake, you are introducing more air to the engine than the stock box. This in turn leans out the air/fuel ratio of the vehicle. leaner=more power. This is temporary, as PCMs learn/adjust to maintain a preset a/f ratio as closely as possible to parameters. In many cases, companies will dyno a stock car (while its warmed up from ride over), then let it cool, then install intake, then make a couple more runs. This is a fairly basic dyno trick to show pretty numbers.
back in 2005 we were building our own intakes for late model trucks. So we used my 2003 5.3 Silverado to test ours vs others. We took painstaking efforts to recreate exact conditions including ambient temps, density altitude measurements, vehicle temps, and also gave the PCM time to adjust the a/f between tests. We literally did eveything overnight where weather conditions remained the same all night. We did:
dyno brand A.
back to stock and dyno again
Dyno brand B.
Over and over. Yes, it was an incredible pain in the ass to prove a point.
You also cannot truly acct for power added to a CAI vehicle on a stationary dyno. We always used a very large heavy duty industrial fan to simulate at least some actual air movement.
At the end of the test almost all CAIs made more power. some, very little. Others including Volant/airaid/and ours made fairly significant gains. By significant, I mean 8-11 HP on the big end and 4-7ft/lbs. Seriously, if you expect more out of a CAI you are really fooling yourself. However, in most cases...the power was seen across the rpm range. For 200-300 bucks you are getting something that looks and sounds cool and adds in most cases, a few extra ponies. Its a fair deal.
All that being said, I installed a Volant on my Hemi 2012 last night and after 50 miles or so I can say I am very happy. Install was a BREEZE! fit and finish is very good compared to others ive used in the past. Sound...well, hell...I have an x pipe and flowmaster 40s. Hard to hear over that
. Butt dyno says theres somethin there though...and past experience backs that up.
Thanks for reading!