Will this bull bar fit on a stock bumper, or do I need to remove the factory bumper first?

Mount this directly to factory frame pickup points without removing the OEM bumper. The bar sits in front of your existing setup. Verify clearance between the bar and any aftermarket lighting or accessories before final installation.

What fasteners do I need to bolt this down?

Hardware is not included with the bull bar assembly. You'll need fasteners rated for frame attachment — check your vehicle service manual for the correct bolt size and torque specs for your specific mounting points.

Can I paint over the black finish if I want a different color?

The powder coat surface is paintable, but it's a hard finish. Light scuffing with medium-grit sandpaper will help new paint adhere better. Primer and topcoat application follow standard automotive paint procedures.