Will this interfere with my trunk seal or undercarriage at highway speeds?

No. The lip is designed for the lower bumper area and sits well clear of trunk seals. At speed, the low-pressure zone under your vehicle actually helps hold it stable. Just verify your current bumper condition before installation — any bending or damage there will affect how the lip sits.

Can I bolt this on without drilling new holes?

Yes. The lip is engineered to use factory mounting points on your bumper assembly. Before you start, inspect your bumper for existing attachment holes and their condition. If you have damage or rust around those points, address that first so fasteners seat cleanly.

What prep work do I need to do before painting?

Sand the surface thoroughly and apply a primer coat to seal the FRP. Your choice of automotive primer and paint will determine the final finish and durability. Once prepped, the lip accepts standard automotive paint systems without issue.