Merge Collector 2-1/4in Primaries 4in Outllet

The Stainless Works Merge Collector 2-1/4in Primaries 4in Outlet is a high-performance exhaust manifold designed to consolidate multiple primary runners into a single outlet for optimized flow characteristics. This 4-into-1 merge collector features 2.25-inch primary tubes that transition to a 4-inch outlet diameter, enabling smoother exhaust scavenging and improved engine efficiency across a broad RPM range. Built from stainless steel in its natural finish, this collector resists corrosion and thermal degradation, making it suitable for both street and performance applications where reliability under sustained heat is critical.

The 2.25-inch primary diameter is sized to match common performance cylinder head configurations and promotes optimal exhaust gas velocity without excessive back-pressure at cruise speeds. The slip-on design simplifies installation and allows for straightforward integration into existing exhaust systems without requiring full system modification. The 4-inch outlet accommodates larger diameter piping downstream, enabling seamless connection to performance mufflers, resonators, or turbocharger inlet pipes. Weighing 3.43 pounds, the collector presents minimal thermal mass while delivering the structural integrity required for sustained high-temperature operation.

This merge collector is engineered for builders focused on exhaust system optimization, whether upgrading a naturally aspirated engine for improved breathing or preparing a boosted platform for turbo or supercharger integration. The stainless construction resists rust formation in humid environments and withstands thermal cycling without warping, critical for applications operating at sustained high exhaust temperatures. Automotive enthusiasts seeking to reduce exhaust restriction while maintaining component durability will find this collector a proven choice for manifold-to-downpipe transitions.