A great LS swap header. These were developed for our ND Miata swaps, but may fit other applications. They've dynoed at over 500 hp at the wheels on an LS3.
Built out of stainless steel for us by PPE with a lifetime warranty. 1.75" primaries with no flange on the outlet. They are not a "long tube" because of packaging constraints. Available as part of our ND V8 exhaust package.