Will this gasket work with an aftermarket header?

This gasket is cut for OEM header dimensions. If you're running an aftermarket header with different flange thickness or bore spacing, test-fit before installation—you may need to source a matched gasket for that specific manifold.

Do I need new hardware to install this?

The gasket itself is the seal—you'll reuse your factory header bolts and studs. Check condition of those fasteners before assembly; if they're stripped or corroded, new bolts are worth the small cost to ensure a tight clamp load.

What prep is needed before I install?

Clean both the header flange and cylinder head mating surface with a wire brush to remove old gasket material and carbon buildup. A clean, flat surface is critical for proper sealing—take time here and you won't fight leaks later.