Radium Fuel Rail - BMW E46 M3 S54 (Rail Only)Radium Fuel Rail BMW E46 M3 S54 (Rail and Mounting Hardware Only) This Radium Engineering fuel rail is CNC machined and anodized aluminium, featuring a large 0. 65" internal bore capable of supporting all necessary engine power requirements on the BMW E46 M3 S54. Compatible with OEM and aftermarket direct fitment fuel injectors, and fully compatible with all fuel types including E85 and all alcohol blends. End ports are tapped for 8AN ORB (3 4" 16 O
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