2-1/2 x 4-1/2 Merge Collector

The DYNATECH 2-1/2 x 4-1/2 Merge Collector is a slip-on exhaust merge collector designed to consolidate four 2.5-inch primary tubes into a single 4.5-inch outlet. This 12-inch-long steel component, finished in black paint, serves as a critical junction point in custom exhaust systems where multiple runners must flow into a unified downstream passage. Built from durable steel construction, the merge collector handles the velocity and heat management demands of high-performance applications where proper scavenging and flow distribution directly impact engine output.

The collector's four-into-one configuration is engineered to balance cylinder scavenging while minimizing turbulence at the merge point. The 4.5-inch outlet diameter provides adequate transition from the primary tubes without excessive backpressure, critical for applications running carbureted or naturally aspirated engines where exhaust scavenging affects cylinder-filling efficiency. At 5.16 pounds and measuring 6.4 x 6.4 x 17.3 inches, the compact footprint accommodates tight engine bay installations while the black paint resists thermal degradation in the high-heat underhood environment. The slip-on design allows integration with compatible piping and muffler systems downstream.

This merge collector is suited for street and competition vehicles running multi-carb setups, custom V8 and V6 builds, or any application requiring clean consolidation of four individual exhaust runners. Hot rodders and engine builders select this type of component when optimizing intake scavenging and exhaust flow characteristics. The steel construction and black finish deliver straightforward durability without additional coating requirements, making replacement and repair straightforward for fabricators and tuners managing complex exhaust systems.

DYNATECH exhaust components are recognized throughout the performance and restoration market for providing functional, competitively priced solutions in manifold, header, and collector applications. The four-into-one merge design is a fundamental building block for anyone constructing custom exhaust systems from individual tube sections, whether for vintage muscle cars, modern swaps, or purpose-built race engines.