Does this require a clear coat, or does it come factory sealed?

Carbon fiber is not UV-sealed out of the box. Apply a high-quality clear coat after final assembly and body prep to protect the weave from UV yellowing and maintain the finish long-term. This also locks the weave and prevents fiber bloom.

How do I prep the edges where pieces join?

Sand all mating edges with fine-grit sandpaper and dry-fit before bonding. Use a quality epoxy or carbon-specific adhesive on edge joints, then apply your topcoat over the entire assembly to seal seams and prevent moisture infiltration at connection points.

Will real carbon fiber be noticeably lighter than OEM plastic diffusers?

Yes. Carbon fiber is significantly lighter than factory plastic or composite diffusers while offering superior stiffness. You'll feel the weight difference when handling, and it contributes to overall weight reduction when installed.