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

Yes. Scrape off old gasket material and carbon buildup from both the header and manifold mating surfaces. A clean, flat surface ensures a solid seal on first installation.

Will this gasket work if I reuse my existing header bolts?

As long as the bolts aren't stripped and torque down evenly, reusing them is fine. Check that they're straight and thread cleanly before reassembly.

Can I install this myself, or do I need a shop?

Header gasket swaps are straightforward for anyone comfortable unbolting the header. You'll need a socket set and basic hand tools—no special equipment required.