Do I need to clean the header and manifold surfaces before installing this gasket?

Yes. Scrape away old gasket material and carbon buildup from both mounting surfaces with a gasket scraper or wire brush. Wipe clean with a lint-free cloth to ensure proper sealing.

Will this gasket work with an aftermarket header?

This gasket is designed for factory mounting geometry. If your header uses non-standard bolt holes or spacing, test-fit before final installation to confirm alignment.

Do you offer a return if it doesn't seal properly?

Returns are handled on a case-by-case basis — contact our support team with photos of the installation and any leak symptoms, and we'll work with you to make it right.