Do I need to clean or prep the header flange before installing this gasket?

Yes. Use a gasket scraper or wire brush to remove all old gasket material and carbon buildup from both the header and manifold surfaces. A clean, flat sealing surface prevents exhaust leaks.

Will this gasket work if I'm upgrading to an aftermarket header?

Confirm your new header uses the same flange bolt pattern and port layout as the OEM V6 header. If the flange geometry differs, you may need a different gasket. Test-fit before finalizing installation.

What should I torque the header bolts to after installing this gasket?

Refer to your vehicle's service manual for the correct torque spec. Proper clamping force ensures the gasket seals without over-tightening, which can warp aluminum flanges.