Do I need to sand and prep this before painting?

Yes. The diffuser Requires Surface Prep, which means the surface is prepared for paint but not yet finished. Sand lightly to ensure proper paint adhesion, then apply your primer and color coat of choice for a seamless factory-quality finish.

What fasteners or hardware do I need to install this?

The diffuser itself is included. For mounting hardware, verify your vehicle's existing rear bumper attachment points and fastener sizes — most OEM fasteners will work, but confirm compatibility with your bumper configuration before installation.

Will this work with an aftermarket exhaust or diffuser that's already installed?

Check your current rear setup for any custom diffusers or extended exhaust tips that might conflict with the new lip profile. This piece is designed to mount at the OEM attachment points, so measure your existing hardware clearance to ensure a flush fit.