4" ID to 3.75" ID - Gloss Black 90 Degree Black Rubber Elbow This standard 8 inch hump

This standard 8 inch hump hose is used to connect two 8" OD intake tubes

For 04 LS1 GTO

This 4" ID to 3-1/2" ID silicone reducing coupler is 3 inches long and has the special matte red finish indicating aramid reinforcement

This 4 inch to 3-1/4 inch reducing silicone coupler is 3 inches long

15" through 4

4" ID to 3.75" ID - Gloss Black 90 Degree Black Rubber Elbow This standard 8 inch humpThis 4 inch to 3 3 4 inch reducing silicone coupler is 3 inches long. Four ply poly reinforced silicone for strength. Perfect for air to air aftercooler systems and turbocharger supercharger connections. Rated at 350 F continuous. Recommended clamps are 94100 0412 on the small end and 94100 0438 on the big end.