The engine is only slightly noisier in the upper rpm range. Unlike most other so called CAIs out there, mine does bring in more air at a colder temperature. A similar commercial product is sold by BANKS POWER: Banks Super-Scoop
It is rather easy to calculate the air flow entering the little scoop: cross sectional area x speed of the vehicle = air flow per unit time. And there is a formula out there for those interested to calculate air intake into the engine, at a given rpm, per unit time. But any supercharging
effects are negligible.
More importantly, engines are exothermic, they give off heat. Which by conduction and convection will heat up everything else in the engine bay. The coldest air available to an engine is at ambient temperature, which is exactly what I am doing.
It is not a mere noise maker. But what can be proven, is the added benefit of colder air and that of a smoother air flow through the intake duct. Which is idiotically long. The intake air filter box should have been on the right side of the car to start with. I will try and calculate it, in my spare time.
What a dyno generally cannot pick up about a CAI adding extra
air, an acceleration test can. For me it is enough proof. This project reminded me of the good old debates about light weight pulleys and flywheels. You cannot measure any improvements in peak power/torque on a dyno but you surely can rev up the engine quicker which makes the difference on the racetrack.
It is a lot of work so... For most people seeking instant gratification and impressive gains, this project is not it.