Aluminum EFI TB Elbow LS 105MM 4150 Flange

The Aluminum EFI TB Elbow LS 105MM 4150 Flange from TOP STREET PERFORMANCE is a precision intake manifold component designed for LS-platform engine builders and performance enthusiasts upgrading to modern electronic fuel injection systems. This throttle body elbow serves as the critical transition between your EFI throttle body and intake manifold, providing a clean, engineered path for fuel-air mixture delivery. Whether you're retrofitting a carbureted LS engine to EFI or optimizing flow on a fuel-injected build, this component ensures proper throttle response and volumetric efficiency in your power plant.

Constructed from lightweight aluminum alloy, this 105MM bore elbow reduces weight while maintaining structural integrity under boost and high-RPM loads. The 4150 flange pattern ensures universal compatibility with standard GM LS throttle bodies and popular aftermarket intake manifolds, eliminating fitment guesswork on your build. The precision-machined design minimizes turbulence and flow restrictions, allowing your engine management system to meter fuel accurately across the entire RPM range. Aluminum's superior thermal conductivity also aids in keeping charge air temperatures stable, supporting consistent air density and ignition timing across varied driving conditions.

This elbow is ideal for street and track LS builds, including LS1, LS2, LS3, and Gen IV platforms running aftermarket EFI conversions. Installation requires basic intake manifold removal and careful torque sequencing to prevent gasket leaks and vacuum bypasses. Pairing it with a quality gasket set and proper sealant ensures years of leak-free operation. The compact 8.7 x 7 x 12.55-inch envelope fits in tight engine bays, making it suitable for swap applications in classic cars, trucks, and performance vehicles seeking modern fuel injection reliability without compromising authentic intake aesthetics.