Create performance for your Volkswagen with our 40mm HPMX Carburetor Kit. This Single Carburetor Kit fits the Dual Port models. The HPMX series have separate idle and main circuits that feature changeable air and fuel jets. The intake air is metered by changeable venturies. Adjustable accelerator pump allows you to maximize acceleration. The HPMX are pre-jetted for your Air Cooled VW.