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Tapered wire mesh construction matches perfectly to stock headers and S&S systems, providing a larger contact area to ensure a perfect seal, preventing gasket crush into the exhaust port, which can obstruct exhaust gas flow.
Designed to work with Evolution Big Twin models' spherical exhaust port.
1984-2000 Evo models
1999-2017 Twin Cam models
2017- later M8 models
1986-later XL models