304 Stainless Bent Elbow 4.000 90-Degree

The 304 Stainless Bent Elbow 4.000 90-Degree from Woolf Aircraft Products is a precision-engineered exhaust or intake piping component designed for high-performance automotive and motorsport applications. This mandrel-bent elbow serves as a critical junction fitting in custom exhaust systems, turbo intake manifolds, and engine bay plumbing where directional changes are required without flow restriction. Whether you're building a competition engine, upgrading a street machine, or fabricating a complete custom exhaust system, this 90-degree elbow maintains consistent bore diameter throughout the bend for optimal flow characteristics.

Constructed from 304 stainless steel, this bent elbow resists corrosion, heat cycling, and the caustic byproducts of combustion—making it ideal for both street and track applications where longevity matters. The 4.000-inch bore diameter accommodates large-displacement engines and high-volume airflow requirements common in turbocharged, supercharged, and naturally aspirated performance builds. The 90-degree mandrel-bent design—as opposed to welded or stamped alternatives—eliminates turbulence-inducing creases and maintains smooth inner geometry, preserving horsepower and reducing exhaust scavenging losses. Aircraft-grade manufacturing standards ensure concentricity, wall thickness consistency, and dimensional accuracy that meets OEM and custom fabrication tolerances.

This fitting is ideal for fabricators, engine builders, and enthusiasts constructing custom exhaust systems, intake manifolds, or turbo charge-air cooler piping on LS engines, big-block Chevys, stroker builds, and late-model performance platforms. The 4.000-inch size is commonly used in headers, collector transitions, and intake runners where maximum flow and heat management are priorities. Installation requires basic tube-fitting knowledge and TIG welding capability; the mandrel-bent design allows for direct welding or clamp-style coupling depending on your system design. Verify bore sizing and positioning against your specific intake or exhaust manifold outlet before purchase to ensure proper fitment and alignment.