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Granatelli 4" to 3.5" silicone reducer sleeve kit includes one sleeve and two clamps (part numbers referenced in the extended text) and is intended for Ford applications per the source. The reducer provides a flexible connection between differing pipe diameters, simplifying installation where a 4" to 3.5" transition is required in an intake or charge system.
Granatelli 4in-3.5in Silicone Reducer Sleeve w/Clamps
