Will this interfere with my trunk seal or rear bumper fitment?

The two-piece design is engineered for clean lower-rear mounting. Before installation, check that your vehicle's trunk and bumper geometry aligns with the diffuser height — measure against your OEM rear panel cutlines to confirm clearance.

Should I use adhesive or drill through for mounting?

That depends on your preference and your vehicle's undercarriage structure. Adhesive offers a cleaner look and no new holes; drilling provides mechanical security. Evaluate your rear bumper and diffuser contact points, then select the method that gives you the most surface area and confidence in longevity.

How stable is this at highway speed?

FRP diffusers are designed for aerodynamic flow without creating lift or drag instability. Ensure your mounting points are solid and all fasteners or adhesive are fully cured before highway use. Inspect fitment every few months to confirm nothing has shifted.