The plug is designed to block the hole left in the inlet manifold of the N57 engine when the swirl flaps are removed. These plugs seal the opening in the intake bridge created after removing the swirl flap shaft. The supplied sp helps maintain correct pressure if the base is worn. Once installed, the swirl flap motor housing is refitted and holds the bung in place. FIT FOR: E90 Facelift: 325d N57, 330d N57, 330xd N57 E91 Facelift: 325d N57, 330d N57, 330xd N57 E92 Facelift: 325d N57, 330d N57, 330xd N57 E93 Facelift: 325d N57, 330d N57 F07 GT Facelift: 530d N57, 530d 155kW N57, 530dX N57, 535d N57S, 535dX N57S F10 Facelift: 525d N57, 530d N57, 535d N57S F11 Facelift: 525d N57, 530d N57, 535d N57S F01 Facelift: 730d N57, 740d N57, 740dX N57S F02 Facelift: 730Ld N57 E70 Facelift: X5 30dX N57, X5 40dX N57S E71 Facelift: X6 30dX N57, X6 40dX N57S Does not fit M57 and B57 engines. Color: Silver + Red Material: Plastic + Metal Package Contents: 1 x Flaps Plug Delete Kit Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.