Performance, reliability and race proven for decades. WEBER Carbs offer ultimate engine tuning with total air and fuel metering and adjustment. The IDF-XE Plus series IDF’s have separate idle and main circuits featuring changeable air and fuel jets. Intake air is metered by changeable venturies and accelerator pump is adjustable for maximum acceleration. Jets, gaskets and repair parts are readily available world wide. All our kits are pre-jetted for VW engines. Choose the appropriate size carburetor for your application. When future engine modification is planned, size-up now! Basic rule of thumb..