Will these add-ons block my rear sensors or parking assist?

The raw pieces do not include pre-drilled sensor holes. Before final installation, measure and mark your vehicle's OEM sensor locations on the FRP surfaces, then drill as needed to maintain sensor function.

How much extension do these pieces add to the overall bumper width?

These are designed as wide body add-ons to expand the rocker and bumper profile. Measure your current bumper width and test-fit each piece to your vehicle before committing to permanent mounting, as final clearance depends on your suspension setup and body condition.

Can I paint these before or after installation?

Both approaches work. Painting before installation reduces masking time and gives you full control over finish quality in a controlled environment. Painting after installation lets you verify final fit first. Sand all surfaces thoroughly and apply primer before topcoat regardless of timing.