aFe Cold Air Intake System (4 IN ID to 3-3/8 IN ID x 90 Deg.) Elbow Reducing Coupler(59-00073) 1708 If you have a look

If you have a look inside the race cars in the staging lanes at your local track

Magnum Force Air Intake Replacement Hardware Kit (59-10062) by aFe

The silicon hose retains this diameter as far as possible and then smoothly tapers downs to the stock turbo inlet

Designed to mate directly with Active Autowerke performance headers

aFe Cold Air Intake System (4 IN ID to 3-3/8 IN ID x 90 Deg.) Elbow Reducing Coupler(59-00073) 1708 If you have a lookMagnum Force Intake Elbow Coupling Kit (59 00073) by aFe. The polyurethane construction is designed to meet modern elevated engine compartment temperatures with a reaction injection molded (RIM) polyurethane configuration. Standard stainless steel worm gear clamps provides tight connections, durability and is corrosion resistance for industrial, commercial, truck, off road and racing applications. aFe (Advanced Flow Engineering, Inc.) manufactures