Do I need to clean or prep the mounting surfaces before installing?

Yes. Scrape old gasket residue and carbon buildup from both the header flange and cylinder head with a gasket scraper. Wipe with a clean cloth to remove debris and ensure a proper seal.

Will this gasket come with new header bolts?

Bolts are not included with this gasket. Use your existing header fasteners or source new ones if yours are worn or stripped. Refer to your vehicle's service manual for proper torque specs.

What should I do if exhaust still leaks after installation?

Verify all bolts are evenly tightened in a cross pattern. If leaking persists, remove the header and inspect both mounting surfaces for warping or damage. A compromised flange or head surface will prevent the gasket from sealing.