I just talked to a dyne shop that told me not to bother with a cai.......
In many cases, a CAI will do little or nothing for performance on a stock engine. That is a fact and we're very honest about the vehicles that have historically gained nothing or even lost power when adding a CAI.
For example, the SRT-10 Ram. It's been shown multiple times over that some of the aftermarket intake systems actually rob power on the stock V-10. Guys still buy them regardless. Some do it for the styling, some do it in support of other engine work.
That being said, these Raptors can gain up to ~5% of usable power throughout the RPM range with an air intake and tune. It's probably just a testament to how restrictive the factory air intake tube and air silencer is. Ignoring the actual raw HP numbers, 5% is pretty significant for bolt on parts.
My guess is that whoever you talked to had a negative experience once with a CAI and has subsequently formed an opinion about all intakes on all vehicles.