BOXI Set of 2 Engine Heater Inlet Pipe and Water Coolant Pipe for BMW E36 E38 E39 E46 E83 E85 320Ci 323Ci 328Ci 330Ci 330xi 520i Z3 Z4 1999-2006 (w/O-Rings) | Replaces 11531705210 11537502525

Unfortunately after installing this product it is not possible to test whether or not it works correctly until you install all the other parts back onto the engine. That being said once I was put back together there was a leak towards the rear of the engine. The only possible cause of this would be the coolant pipe. It was a hard fit to get into place but did eventually fit correctly. Fault may be due to hose to pipe connection. Other than that product was of good quality and Seemed like it was made to withstand many hours of operation. Product also arrived very quickly

The more bent pipe fit terribly. The 2 bolts didn't line up very well, so the pipe is under stress when installed. Worse yet, it rubs on / pushes against the throttle body. Also, the cable box that goes under the intake manifold could not be bolted back into place because the it was hitting the coolant pipe.

Almost perfect fit

Perfect fit...no more coolant leak