Polini inlet pipe with 50.5mm connector width. The funnel-shaped pipe (Venturi) optimises the airflow to the carburetor, and accelerates the intake air mass. The funnel is simply attached to the carburettorflange to which the filter is normally attached. The funnel can be used for sprint racing and show purposes or as an air filter adapter. Supplied is a 19 mm-long intake funnel with 50.5mm connector width 79 mm outside diameter.