4" ID to 3.8" ID coupler - Gloss BlackThis 4 inch to 3. 8 inch reducing silicone coupler is 3 inches long. Rated at 350 F continuous. Four ply poly reinforced silicone for strength. Perfect for air to air aftercooler systems and turbocharger supercharger connections. Fits on most LS1 MAF's. Recommended clamps are 94100 0438 on the big end and 94100 0425 on the small end.
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