Do I need new hardware to install this?

You'll use your existing OEM mounting points and hangers. Have some new gasket material and clamps on hand in case originals are damaged during removal, but the system bolts to factory attachment points.

Does this come with brackets or hangers?

Mounting method and hardware are not detailed in the specs — test-fit before deciding whether to use existing hangers or add new ones.

Will I need to weld or modify anything?

This is a direct bolt-on system; no cutting, welding, or fabrication required. Everything connects at factory locations.