A CAI on any vehicle that has not had the rest of the "air pump" modded - is a waste of time and money. Noise makers.
If every station in the "air pump" is modded you will get a gradually complimentary cumulative effect and even then - not what most people would probably think and trust me - it is Expensive.
The motor is an air pump. Air in - cumbustion - exhaust out.
Master that and you have the key to the power making kingdom.
It is both art and science.
The guys that are good understand the mix (no pun intended)
I have gotten a NA Camaro with a meticulously modified LS6 motor to 550 hp by modding every step from front to rear custom building every single ingredient at a price tag rivaling a completed car just to add that H.P.
IF a $250 box could do anything to a stock motor they would be selling them on every street corner.
It's snake oil.
The seat of the pants Dyno is akin to the really good looking girl paying attention to the fat guy at the bar - they both empty wallets.