Features: 1. Certain models may experience issues related to the swirl flaps in the intake manifold. The screws securing the flaps can loosen over time, potentially leading to engine damage. This issue has been documented in various automotive resources. Replacing the original swirl flap bungs with upgraded components may help prevent potential engine damage. 2. The original swirl flaps have a design that may be susceptible to failure. If a flap breaks, debris could enter the engine and potentially damage internal components such as valves, pistons, or cylinder heads. 3. These blanking plugs are made from reinforced aluminum designed for automotive use. They are intended to seal 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.