What is this box on my air intake for?

[99WhiteC5Coupe]

It draws air from the fender like the original intake, uses a larger intake tube in the fender

The existing throttle body and its connecting ductwork will only flow so much air. You could have an intake tube in the fender the diameter of a 30 gallon garbage can and the car would not necessarily flow more intake air.

 

[Logan97]

The existing throttle body and its connecting ductwork will only flow so much air. You could have an intake tube in the fender the diameter of a 30 gallon garbage can and the car would not necessarily flow more intake air.

I know, but the small increase in size has made a small difference when accelerating and it sounds pretty good . I wasn't looking for huge gains when I put it on. Gonna buy a bbk throttle body and have a larger exhaust system put on, see how that goes.