It is recommended to remove intake manifold swirl flaps from your M57 engine and replace them with aluminum plugs if this hasn’t been done yet. For M57 engines, BMW used two different swirl flap diameters – 22mm or 33mm. For some BMW models, the diameter may vary based on emission standard (Euro 3/4), so please carefully review the fitment information below before placing your order. FITMENT INFORMATION: BMW 3 Series: E46 330d/xd (135kw / 184hp) M57 – 22mm (Models with automatic transmission only) 330d/xd/Cd (150kw / 204hp) M57N – 22mm (Euro 3) 330d/xd/Cd (150kw / 204hp) M57N – 33mm (Euro 4) (Explanation: Euro 3 models use a vacuum turbo actuator, while Euro 4 models use an electronic turbo actuator). BMW 3 Series: E90, E91, E92, E93 325d (145kw / 197hp) M57N2 – No flaps! 330d/xd (170kw / 231hp) M57N2 – 33mm 335d (210kw / 286hp) M57N2 – 33mm BMW 5 Series: E39 525d (120kw / 163hp) M57 – 22mm 530d (135kw / 184hp) M57 – 22mm 530d (142kw / 193hp) M57 – 22mm (All E39’s with automatic transmission only) BMW 5 Series: E60, E61 525d (130kw / 177hp) M57N – 33mm 525d/xd (145kw / 197hp) M57N2 – No flaps! 530d (160kw / 218hp) M57N – 22mm (Euro 3) 530d (160kw / 218hp) M57N – 33mm (Euro 4) (Explanation: Euro 3 models don’t have DPF and use a vacuum turbo actuator, while Euro 4 models have DPF and use an electronic turbo actuator). 530d/xd (170kw / 231hp) M57N2 – 33mm 530d/xd (173kw / 235hp) M57N2 – 33mm 535d (200kw / 272hp) M57N – 33mm 535d (210kw / 286hp) M57N2 – 33mm BMW 6 Series: E63, E64 635d (210kw / 286hp) M57N2 – 33mm BMW 7 Series: E38 730d (135kw / 184hp) M57 – No flaps! 730d (142kw / 193hp) M57 – 22mm BMW 7 Series: E65, E66 730d (160kw / 218hp) M57N – 22mm 730d/Ld (170kw / 231hp) M57N2 – 33mm BMW X3 Series: E83 30d/xd (150kw / 204hp) M57N – 33mm 30d/xd (160kw / 218hp) M57N2 – 33mm 30sd (210kw / 286hp) M57N2 – 33mm 35d/xd (210kw / 286hp) M57N2 – 33mm BMW X5 Series: E53 30d/xd (135kw / 184hp) M57N – No flaps! 30d/xd (160kw / 218hp) M57N – No flaps! (Euro 3) 30d/xd (160kw / 218hp) M57N – 33mm (Euro 4) (Explanation: Euro 3 models don’t have DPF and use a vacuum turbo actuator, while Euro 4 models have DPF and use an electronic turbo actuator). BMW X5 Series: E70 30d/xd (173kw / 235hp) M57N2 – 33mm 30sd (210kw / 286hp) M57N2 – 33mm 35d/xd (210kw / 286hp) M57N2 – 33mm BMW X6 Series: E71 30d/xd (173kw / 235hp) M57N2 – 33mm 35d/xd (210kw / 286hp) M57N2 – 33mm Note: If your model is not listed here, then your M57 engine most likely does not have swirl flaps. If you are still not sure, please send us your VIN number. KIT INCLUDES: 22mm / 33mm aluminum plugs (6 pcs) Intake manifold gasket set (13 pcs) To ensure a long-lasting seal, it is recommended to apply a thin layer of sealant on the O-rings of the plugs. DO NOT use sealant on the intake manifold gaskets.