It is the Inter cooler pump. I had mine replaced under the Certified used warranty. So if its Warranty go with the stock pump. If not get the Johnson Pump. Bosch seems to have issues with their products. The Bosch High pressure Fuel pump in all of the BMW twin turbos is a pos.I went through 3 in 18000 miles. It was a 135I I was glad the lease was up and I could give it back to BMW its their problem now.