Will this interfere with my trunk seal?

These rear lip diffusers mount to the lower bumper area, not the trunk lid. Check your bumper's cutout dimensions and existing mounting points before drilling. The two-piece design gives you flexibility in how you position each side relative to your specific trunk configuration.

Can I use adhesive instead of drilling?

FRP responds well to both adhesive and mechanical fastening, depending on your preference. Adhesive installation offers a cleaner look with no visible holes, while drill-through mounting provides more permanent security on a daily-driven car. Choose your method based on whether you prioritize appearance or stability at speed.

How stable are these at highway speeds?

FRP's rigidity and the two-piece split design keep flex minimal. Once properly mounted—whether adhesive or mechanical—these sit flush and stable. Verify your fastening method is secure before extended highway runs; a loose panel can rattle and eventually lift at speed.