EMPI 5746 Universal SU / Bubble Type Carburetor Synchronizer - VW Dune Buggy Bug Ghia Thing Bus Trike Baja Down Draft / Side Draft Provides A Visual Method Of Balancing Multiple Carburetor Setups With A High Degree Of Accuracy Ideal For Down Draft & Side Draft Applications For Volkswagen And VW based Dune Buggies Proper Synchronization For Peak Performance