3-1 Merge Collector 1.75 in Inlet ID/2.5in Outlet

The 3-1 Merge Collector 1.75 in Inlet ID/2.5 in Outlet by VIBRANT PERFORMANCE is a high-flow exhaust header merge collector designed for engine builders and performance enthusiasts seeking efficient multi-runner consolidation. This component bridges the critical transition between individual exhaust runners and a single exhaust outlet, serving as the foundation for optimized scavenging and back-pressure management on carbureted, naturally aspirated, and turbocharged builds.

Engineered with precision-welded construction, the 3-1 merge collector features 1.75-inch inlet diameter runners that taper to a 2.5-inch outlet, creating smooth flow transitions that minimize turbulence and separation. The stepped design allows each runner to maintain velocity while converging energy, reducing waste heat and resonance—critical for maximizing exhaust scavenging across RPM ranges.

VIBRANT PERFORMANCE's proven manufacturing process ensures consistent internal geometry and durability, with robust welds rated for extended high-heat operation and vibration resistance across repeated thermal cycles. This merge collector fits small-block and mid-size engine platforms with standard three-runner header configurations, making it ideal for street rods and weekend racers.