Yes... I have one now and have had them in the past, it's a standard Hinda throttle body tapered out on the air intake side, think it's tapered to 68mm if memory serves me correctly
Wouldn't say it made the world of difference on a standard map, increases throttle response a little, but good if your going to get it mapped in.
Don't know if it increases total airflow but think it increaes the speed of the airflow with the tapering creating a funnelling effect, Spoon call it the Venturi effect