I like the idea of the union. Wish I had done that.
In my situation, there was no chance I could tighten, or adjust the angles of the pipes when they were installed on the boat. To much boat yoga. It was significantly easier to remove the whole assembly and get it on the dock and use 2 pipe wrenches to do the work. Having studs really helps out. I was able to get a pipe wrench to work well on the exhaust flange, I didn't have access to a vise.
Instead of removing the exhaust hose off of the water injection nipple, I remove to hose from the water lift muffler. It works a lot better for me.
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