Features: 1. Some models are known to experience issues with the swirl flaps in the inlet manifold. The screws securing the flaps may loosen over time, potentially leading to engine damage. This is a recognized issue that has been widely documented in automotive forums and publications. Replacing the original swirl flap bungs with these upgraded blanks helps prevent potential engine damage. 2. The original swirl flaps have a design that may be prone to failure. If a flap breaks, debris can enter the engine, potentially causing damage to internal components such as valves, pistons, or cylinder heads. 3. These blanking bungs are constructed from reinforced aluminum designed for automotive applications. They are and of high quality. Specifications: Suitable for E87, E46, E60, E61 (4-cylinder models) For E30, E46 3 Series (E46 03–06) 320cd, 330cd 5 Series E39 (97–03) 520d, 525td, 530d Color: Red + Silver Material: Aluminum + Silicone Package Contents: 4 x 22mm swirl flap blanking bungs 4 x square sealing rings 5 x round sealing rings Note: The package includes only the items listed above. Other products are not included. Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1–3 cm.