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The Weber IDF dual-throat downdraft carburetor is an excellent choice for many applications ranging from V8 and V12s to highly modified VW-based engines. Twin 48IDFs are ideal for the most radical 1500-2300cc engines.
The 48IDF is supplied without a choke mechanism. This makes it better able to handle dusty environments, but cold driveability suffers. It is recommended for racing or warm-weather "pleasure motoring" only.