what is the box under the stock air box

[Viperi]

what is the box that is attached under the stock air box? some type of resonator? can i remove it for better sound?

 

[fxlr8]

It's a resonator and yes you can remove it.

 

[Viperi]

It's a resonator and yes you can remove it.

cool will it give the fx a better sound?

 

[la_fx35]

then you can hear it sucking air

 

[tchuck]

cool will it give the fx a better sound?

Helmholtz resonators are intended to reduce sound at a very specific frequency. Removing it will make a certain point in your rpm range slightly louder. Whether or not it is "better" is your call. Infiniti doesn't think so...