The N54 engine sees failure at the plastic cylinder head outlet adapter connecting the cylinder head to the thermostat hose. For N54 3.0L twin-turbo motors 335i, 335xi, 135i and 1M. For N20 (2.0L turbo) Z4 2013 & up.
Coolant Water Hose Fitting for BMW N55 N54 N53 N52 N20 11537541992 11537544638
Aluminum Water Hose Fitting for BMW 335i 335 N54 N52 11537541992 11537544638
Coolant Hose Flange Fitting Water Hose Fitting Aluminum For BMW N52 N54 N53
Trans-Dapt for WATER PUMP FITTING for 3/4 in. HOSE 1/2 in. NPT-CHROME
Transdapt 9515 Water Pump Fitting For 5/8 In. Hose 1/2 In. NPT-Chrome
