3-1 Merge Collector 1.5 in Inlet ID/2.5in Outlet

The VIBRANT PERFORMANCE 3-1 Merge Collector with 1.5 in inlet ID and 2.5 in outlet is a slip-on exhaust manifold collector designed to consolidate three primary runner tubes into a single, larger-diameter outlet. Built for enthusiasts upgrading factory exhaust systems or building custom headers, this stainless steel merge collector bridges the gap between multi-tube primary runners and downstream piping, making it an essential component in any forced induction, naturally aspirated, or mid-range engine modification project.

Constructed from high-quality stainless steel in natural finish, the 3-1 Merge Collector minimizes exhaust turbulence and flow restriction by merging three 1.5 in primary tubes into a smooth 2.5 in outlet diameter. This geometry reduces backpressure while optimizing scavenging characteristics—critical for maximizing horsepower and torque across the powerband. The slip-on design allows straightforward bolt-up installation to existing headers or custom fab work, and the stainless construction resists thermal stress and corrosion from sustained high-temperature exhaust flow. Compact dimensions (6.6 x 6.4 x 12.2 inches) and lightweight construction at 1.75 lbs keep packaging tight without sacrificing durability.

This merge collector is ideal for engine builders, street performance tuners, and track enthusiasts working with tri-tube primary headers on 4-cylinder or small-displacement V-engines. Common applications include EJ-series Subarus, K-series Hondas, 4A-GE Toyotas, and similar platforms where header tube count and sizing drive exhaust scavenging efficiency. Installation requires basic hand tools and knowledge of exhaust system assembly; verify inlet tube diameter and outlet compatibility with your downstream piping before purchase. Whether you're chasing peak power at the dyno or building a daily-driver with upgraded breathing, the VIBRANT PERFORMANCE merge collector delivers proven results at an accessible price point.