Collector 2-1/4 X 4in X

The Collector 2-1/4 X 4in X exhaust collector by DYNATECH is engineered for serious engine builders and performance enthusiasts who demand efficient exhaust scavenging and responsive power delivery. This slip-on collector design consolidates multiple cylinder runners into a single 4-inch outlet, making it an essential component for naturally aspirated and modified engine combinations seeking to optimize exhaust gas flow dynamics. Whether you're building a street machine, weekend track car, or restoration project, a quality collector directly impacts how effectively your engine breathes and how much power you can extract from your displacement.

DYNATECH's Collector 2-1/4 X 4in X features mandrel-bent tube construction that minimizes turbulence and maintains consistent wall thickness throughout each runner transition. The 2-1/4-inch primary tube diameter is sized to promote optimal scavenging velocity while the 4-inch collector outlet provides smooth convergence of exhaust gases, reducing backpressure and improving volumetric efficiency across the RPM band. This stepped design allows the collector to accommodate various header configurations and engine platforms, making it a versatile choice for both small-block and mid-sized engine applications where controlled exhaust velocity directly translates to measurable horsepower gains and improved throttle response.

Installation works best when paired with a quality header set and aftermarket exhaust system designed for your specific engine platform and displacement. The collector's slip-on design allows technicians to fine-tune header-to-collector transitions, ensuring proper runner alignment and eliminating leaks that compromise efficiency. Weighing 5.05 lbs, the compact 17-inch length simplifies packaging in tight engine bays while maintaining the structural rigidity needed for high-RPM reliability. This DYNATECH collector (MPN 783-71240) is ideal for builders upgrading from restrictive factory exhaust or OEM-equivalent collectors who want measurable improvements in scavenging efficiency and top-end power without replacing their entire header system.