Do I need to weld these pipes, or can they be bolted together?

These are cut and fit components—you'll need to weld them. Bolted connections won't hold up to exhaust heat and vibration long-term.

Will this kit fit my vehicle as-is, or do I need to custom-bend and cut?

This is a universal kit, so expect to measure, cut, and bend to match your under-car routing. Test-fit before welding anything permanently.

Can I paint or coat these pipes, or do they need surface prep first?

Bare mild steel will surface-rust quickly. Sand and prime before any coating, or leave them raw if you want the natural patina. High-temp paint or ceramic coating works well once prep is done.