no, you do not need to remove the water pump for this job. you can simply unbolt the screws (10mm head) that hold the valley pan to the block and lift it up at the rear and remove. the short pipe is rubber coated and may give you some fits but it comes right out. it should always be replaced. the other question is that t fitting is a leak prone problem. i would replace that while you are in there.

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BMW Level 1 Tech