Hey Gang,

Does anyone make metal cooling system parts for the E53? I'd like to improve reliability and lifespan by replacing my expansion tank & water pump with ones made of metal. I believe the water pump impeller blade is made of plastic, but I could be wrong there.

Zionsville does make metal radiators, so that's a start...

https://www.zionsvilleautosport.com/...inum-radiator/

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2005 4.8is Black/Black (sold)
1990 325is Alpine White/Tan
2005 325i manual
2018 X3 M40i