Will this interfere with my trunk seal or undercarriage when the suspension compresses?

The CGS profile is designed with minimal extension to avoid contact during full suspension travel. Verify clearance by checking the lip against your bumper at full bump and droop — FRP has some flex which accommodates minor variations in factory bumper fitment.

Should I use adhesive or drill through the existing bumper holes to secure this?

Factory mounting points are drilled through. Adhesive alone is not recommended for this component due to road vibration and thermal cycling. Use the existing holes and fasteners appropriate for your OEM bumper setup.

Will the FRP remain stable at highway speeds?

Yes — the single-piece construction and factory-aligned mounting points provide solid support at speed. Ensure all fasteners are tight before driving, and verify the lip sits flush with the bumper across its full width before finalizing installation.