Ball Flange Header Collector Kit 3in to 2.5

The Flowmaster Ball Flange Header Collector Kit 3in to 2.5 is an essential exhaust transition component designed for custom headers and performance exhaust builds. This collector reducer bridges the gap between multi-tube header primaries and your vehicle's midpipe or resonator, making it indispensable for engine builders, fabricators, and automotive enthusiasts tackling header upgrades. The ball flange design allows for precise angular alignment, accommodating the natural divergence of header tubes as they merge into a single 2.5-inch outlet.

Constructed from steel in natural finish, this kit features a two-bolt ball flange connection on both inlet and outlet ports for secure, leak-free installation. The 3-inch inlet accepts multiple primary tubes while the 2.5-inch outlet provides smooth flow transition to your exhaust system. The ball flange design—superior to traditional flat flanges—permits slight angular misalignment without compromising seal integrity, a critical advantage when working with tight engine bays or non-ideal header angles. Weighing 5.7 pounds with compact dimensions (9.3 x 4.5 x 10.1 inches), this collector is engineered to fit in space-constrained applications while maintaining structural rigidity and thermal stability.

This collector kit is ideal for custom street rods, performance engine swaps, and vehicles with aftermarket header installations where OEM exhaust geometry no longer applies. Mechanics and fabricators appreciate the two-bolt ball flange system for its forgiving fit tolerance and repeatable clamping performance. Installation pairs easily with standard exhaust clamps and gasket material, and the natural steel finish can be ceramic coated or wrapped for heat management. Verify inlet tube diameter compatibility with your specific header bundle size before ordering to ensure proper fitment in your custom exhaust system.