Header Reducers-2 1/2in 3 Bolt

The Header Reducers–2 1/2in 3 Bolt by Hedman is a critical intake manifold adapter designed to downsize header outlet ports for custom engine builds and modern fuel injection conversions. Whether you're retrofitting a high-flow fuel injection system onto a classic V8, managing turbocharger plumbing constraints, or adapting headers from a different engine family, these reducers solve the common problem of mismatched port diameters between exhaust manifolds and downstream components. This 2.5-inch reducer with three-bolt mounting pattern is essential for builders who demand precision fitment without welding modifications.

Hedman header reducers are precision-cast from durable iron or ductile iron, engineered to handle exhaust gas temperatures and vibration cycles that would compromise cheaper alternatives. The three-bolt configuration ensures rigid, repeatable installation that prevents exhaust leaks—critical for maintaining back-pressure calibration in EFI systems and preserving dyno-tested performance curves. At 2.61 pounds, the compact 5.85 x 4.15 x 6.95-inch form factor fits tight engine bays without requiring extensive header repositioning, making it ideal for both street restorations and race builds where clearance is at a premium.

Engine builders, performance shops, and serious enthusiasts rely on the Header Reducers–2 1/2in 3 Bolt when transitioning from carbureted to fuel-injected powerplants or when mixing and matching headers from different manufacturers. Installation is straightforward—bolt directly to your header outlet using the three-hole pattern—and the reducer threads smoothly into your exhaust piping or manifold elbow. Verify your header's bolt pattern and outlet size before ordering; this adapter is specific to 2.5-inch downsize applications and works with both stock and performance exhaust systems.