4-1 S.S Merge Collectors 2.125In Inlet Id 3.5In

The 4-1 S.S Merge Collectors 2.125In Inlet ID 3.5In outlet exhaust manifold is designed for serious engine builders and performance enthusiasts focused on maximizing scavenging efficiency and peak horsepower in four-cylinder applications. This stainless steel merge collector consolidates four primary tubes into a single outlet, making it essential for setups where equal-length runner design and thermal retention are critical.

Constructed from premium stainless steel, this merge collector resists thermal stress and corrosion, ensuring longevity in high-heat environments. It effectively manages exhaust pulse overlap and backpressure, unlocking additional power across the RPM band. The 2.125-inch inlet ID balances scavenging velocity with low restriction, while the 3.5-inch outlet diameter allows for a smooth transition into your downpipe or turbo inlet.

Whether you're building a street engine or a weekend track car, this collector's design reduces turbulence at the merge point and minimizes pressure spikes that can rob power and create noise. Its equal-length principle ensures that each cylinder scavenges at peak efficiency across your target RPM range, making it a valuable addition to any performance four-cylinder engine build.