Ball Flange Header Collector Kit 2.5 to 2.5

The Flowmaster Ball Flange Header Collector Kit 2.5 to 2.5 is a precision exhaust manifold reducer designed for serious engine builders and performance technicians who demand seamless collector transitions. This 2-bolt ball flange assembly bridges the gap between dual 2.5-inch primary tubes and a 2.5-inch outlet, making it an essential component when consolidating multiple exhaust paths into a single secondary tube or downpipe. Whether you're building a custom exhaust system, transitioning from split collectors, or adapting aftermarket components to your platform, this collector kit provides the structural integrity and flow characteristics that separate amateur fabrication from professional results.

Manufactured from durable steel with a natural (unpainted) finish, this reducer utilizes a ball flange design that allows for precise alignment during installation while maintaining consistent bore diameter throughout the transition zone. The female inlet accommodates 2.5-inch tubing on both primary sides, while the male outlet threads smoothly into your secondary exhaust path with zero step-down, preserving velocity and minimizing turbulence at the junction point. At 6.43 pounds and compact dimensions (8.5 x 4.5 x 11.5 inches), the assembly is light enough for performance applications yet robust enough to withstand sustained high-temperature cycling and engine vibration without warping or cracking.

Technicians restoring vintage muscle cars, tuning modern LS-series engines, or fabricating custom headers will find this collector kit indispensable for achieving OEM-quality welds and alignment. The 2-bolt ball flange interface allows for bolt-together construction, eliminating the need for continuous welding in tight engine bay spaces and enabling future disassembly if exhaust modifications become necessary. Proper installation requires secure fastening and heat shielding where the collector contacts engine block components or nearby wiring, ensuring both longevity and safety in high-output applications.