3" ID to 2" ID - Matte Red - Aramid 500 Degree Silicone 90 Degree Reducing Elbow and then the 4" intake

and then the 4" intake tube fits in the hole

Hose Type Stainless Steel Braided Rubber Hose AN Hose Size AN6

This 2" OD carbon fiber straight tube is used in air intake systems

including the FAST 102

5" intake tube to an air cleaner

3" ID to 2" ID - Matte Red - Aramid 500 Degree Silicone 90 Degree Reducing Elbow and then the 4" intakeThis 3" ID to 2" ID silicone reducing coupler is 3 inches long and has the special matte red finish indicating aramid reinforcement. Perfect for air to air aftercooler systems and turbocharger connections. Rated at 500 F continuous. Recommended clamps are 94100 0238 on the small end and 94100 0338 on the big end.