Features: 1. Some models have experienced issues related to the swirl flaps in the intake manifold. The screws securing the flaps may loosen over time, potentially leading to engine damage. This is a known issue that has been widely discussed in automotive forums and publications. Replacing the original swirl flap bungs with upgraded components can help 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 plugs are constructed from reinforced aluminum designed for automotive applications. They are intended to block the swirl flap ports after removal, helping to prevent future issues. Product specifications: - Suitable for E87, E46, E60, E61 (4-cylinder models) - Compatible with E30, E46 3 Series (2003–2006) 320cd, 330cd; 5 Series E39 (1997–2003) 520d, 525td, 530d - Color: Red + Silver - Material: Aluminum + Silicone Package contents: - 4 x 22mm swirl flap blanking plugs - 4 x square sealing rings - 5 x round sealing rings Note: The package includes only the items listed above. Other accessories or components are not included. Note: Lighting and display settings may cause slight variations in color between the product image and the actual item. Measurement tolerances may vary by +/- 1–3 cm.