A common problem with both road and race cars is that the E46 M3 plastic expansion tank splits due to age and temperature. Bimmerworld’s precision fabricated aluminium expansion tank (made by Moroso) is designed as a direct replacement parts and puts a stop to these problems.

Universal expansion tanks cause headaches with fitment, where as Bimmerworld’s comes as a direct drop-in with no modification needed other than to short the two wires for the level sensor, which is no longer applicable. This race-quality piece comes complete with a Moroso 2 bar cap.

Perfect in combination with a KED Coolant Expansion Hose Kit.