Will this bolt directly to my truck without adapters?

Yes. This Y-pipe is engineered to mount at your factory connection points. Get the old unit off, slide this on, and torque it down to spec per your service manual.

Does it come with new gaskets or fasteners?

The assembly itself is confirmed. Bring fresh gaskets and bolts to the job—reusing old hardware on exhaust work is asking for leaks.

Does this require any welding or custom pipe work?

No welding needed. This is a bolt-in replacement designed to sit in your factory exhaust path. Prep the mounting surfaces, line it up, and clamp it down.