Do these require drilling into the body?

No. Over-fenders mount on top of your existing panels using the factory bolt holes. Check your vehicle's OEM mounting points before install to confirm hole alignment with your setup.

What prep work do I need to do before painting?

Sand the surface to promote paint adhesion, then clean thoroughly to remove dust. Apply your chosen primer and topcoat per the paint manufacturer's instructions. Proper surface prep ensures long-lasting color and gloss.

Will these affect my tire clearance or suspension?

Over-fenders sit above the factory line and do not interfere with suspension geometry or tire movement. Verify fitment with your current wheel and tire size — wide aftermarket setups may sit closer to the fender lip depending on offset and sidewall height.