BMW Upgraded Aluminum Thermostat Housing 6-Cyl E34, E36, Z3
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Replace the problematic factory plastic thermostat housing ( pn: 11531722531) with this more reliable cast aluminum thermostat housing. Fits the M50 M52 and S52 engines, 325i 328i M3 Z3
Not for: 528i '97-98
Other BMW perfomance shops sell this item for $ 24 - $ 48 !!