Our ducktail spoiler is designed with a shorter center and taller edges to optimize cleaner airflow, resulting in noticeable stability improvements starting at 100-120 km/h (60-75 mph). (Note: These effects are based on a stock car. Modifications to suspension or other aero components may reduce the impact.) The assembly holes between the wing and mounts are pre-drilled and allow for adjustable in-out positioning of the wing. All necessary hardware is included (rivets, bolts, and nuts). Optional mounting with Rivnuts or Jack nuts is possible but not included. The spoiler features a highly durable textured powder coating.