45 Degree Transition Hose 3.5in I.D. to 4in

The 45 Degree Transition Hose 3.5in I.D. to 4in by Vibrant Performance is a precision intake and exhaust ducting component designed for custom automotive builds, turbo installations, and high-flow engine modifications. This transition hose bridges diameter changes in your intake or intercooler piping systems, eliminating the need for rigid metal elbows and allowing flexible routing in tight engine bays. Whether you're upgrading a supercharged platform, integrating a larger-diameter intercooler, or fine-tuning cold-air intake flow, this hose adapts your system to non-standard plumbing configurations while maintaining structural integrity under boost pressure and thermal cycling.

Constructed from durable reinforced silicone, the 45-degree angle design minimizes turbulence and pressure drop compared to multiple 90-degree bends, optimizing airflow dynamics for both naturally aspirated and forced-induction applications. The 3.5-inch inner diameter inlet transitions smoothly to a 4-inch outlet, accommodating upgrades from smaller factory or OEM-equivalent piping to larger-diameter tubing without stepped transitions that create flow restrictions. Vibrant Performance's engineering ensures consistent wall thickness and precise bore sizing to handle boost levels, intercooler spray coolant exposure, and sustained operating temperatures without deformation or leakage. The hose's compact footprint—measuring approximately 14.17 inches long with a 4.17-inch core width—fits into confined spaces where fabricated aluminum elbows would require extensive rerouting of adjacent components.

This transition hose is ideal for tuners upgrading intake manifold runners, installing larger intercoolers on turbocharged or supercharged vehicles, or routing charge pipes around engine bay obstacles. It's compatible with any boost system using silicone hose couplers and standard automotive hose clamps, making it a drop-in solution for custom fabrication. The lightweight construction at 1.27 pounds minimizes engine bay weight while its heat-resistant silicone formulation withstands intake air temperatures and exhaust bypass conditions typical in high-performance applications. Professional installers and DIY builders alike rely on Vibrant Performance transition hoses to complete clean, functional intake and charge pipe layouts without compromising flow or durability.