4 into 1 Merge Collector 1.75 to 3in

The 4 into 1 Merge Collector 1.75 to 3in from VIBRANT PERFORMANCE is an essential exhaust manifold component designed for high-performance engine builds where four individual runner tubes must converge into a single outlet. This collector bridges the critical transition point between your primary tubes and downstream exhaust piping, making it ideal for custom engine swaps, turbo conversions, and street or track applications. Whether you're upgrading a carbureted V8, installing a supercharger, or optimizing a naturally aspirated four-cylinder, a quality merge collector ensures smooth gas flow while minimizing turbulence and backpressure.

VIBRANT PERFORMANCE engineers this 4 into 1 collector with precision welding and mandrel-bent construction to reduce internal restrictions and turbulence that rob power and efficiency. The 1.75-inch primary tube inlets accept standard primary tubing diameters, while the 3-inch outlet diameter provides ample capacity for mid-range to aggressive cam profiles without excessive scavenging losses. The compact 12.1-inch length and lightweight 2.9-pound design minimize packaging constraints and engine bay heat load, while the heavy-duty steel construction withstands sustained high-temperature exhaust cycles. This geometry promotes efficient gas merging, critical for maintaining scavenging effect that improves cylinder-to-cylinder exhaust evacuation and boosts overall engine breathing.

Engine builders and performance enthusiasts benefit most from this collector when pairing it with a custom-built primary tube header set designed for 1.75-inch runners. It works seamlessly in turbocharged, supercharged, and naturally aspirated applications where exhaust scavenging and thermal efficiency matter. Installation requires proper V-band or flange coupling to your header primary tubes and downstream piping; ensure your exhaust system is designed as a complete package for optimal flow dynamics. Verify primary tube sizing and outlet compatibility with your turbo inlet, catalytic converter, or muffler before purchase to guarantee a leak-free, high-flow setup.