Do I need to modify my exhaust system to bolt these on?

These connect to your existing exhaust downstream of the collector. You may need to adapt or modify your current piping depending on what's already there — test-fit before welding or clamping anything permanently.

Will these headers fit my car without drilling into the frame?

Long tube headers mount at the factory engine bay attachment points — no frame drilling required. Tight underbody clearance is the concern on some setups, so verify fitment in person if you're running a tight engine bay or custom suspension.

Do these come primed or do I need to paint them?

Stainless steel headers don't need primer or paint. They're bare metal and will age naturally. If you want them coated for looks, ceramic or high-heat paint is optional but not required for function.