CAC Transition Hose 4in Inlet to 3.5in Out

The CAC Transition Hose 4in Inlet to 3.5in Out from Vibrant Performance is a precision-engineered intercooler connection designed for turbocharged and supercharged engine builds where diameter reduction is necessary downstream of the charge air cooler. This transition hose bridges the gap between larger CAC outlet piping and smaller downstream components, maintaining boost pressure integrity while accommodating varied intake manifold or throttle body configurations. Whether you're upgrading cooling efficiency on a performance street car or optimizing a dedicated track build, this stepped diameter hose eliminates the need for multiple elbows and reduces turbulence at the transition point.

Manufactured by Vibrant Performance, a trusted name in turbo and supercharger plumbing, this transition hose features mandrel-bent construction that preserves internal diameter consistency and minimizes boost loss at the inlet-to-outlet step. The 4-inch inlet couples directly to standard CAC discharge ports, while the tapered 3.5-inch outlet accommodates most aftermarket or OEM intake paths without fitment modifications. Premium silicone construction rated for sustained boost pressures ensures durability under high compressor discharge temperatures, while the smooth internal geometry reduces air resistance compared to adapter fittings. At 0.67 lbs and compact dimensions, installation is straightforward and doesn't add unnecessary weight to your engine bay.

Ideal for builders working with popular turbo kits (Nissan R35 GT-R, BMW N54/N55, or Honda K-series platforms) where CAC outlet diameter varies from downstream plumbing, this transition hose is essential for reliable boost delivery and cooling circuit integrity. Professional shops and experienced enthusiasts rely on Vibrant Performance connectors for OEM-quality fitment and long-term reliability under sustained boost. Pair with compatible 4-inch CAC discharge hose and 3.5-inch intake piping for a complete, efficient charge air system that maximizes intercooler effectiveness and engine response.