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Wow, I can't imagine it being way louder. I have to roll up the windows when driving cause that's all I hear now. It's just weird that its that loud now after they tested it for the recall.

I took my 2020 Ram (24,000 miles) to the dealership for a new turbo and new DPF. While it was being worked on, they checked the CP4 pump and said it was fine. I pick up the truck, bring it home and now the CP4 pump is making a rattling noise. It wasn't there before now it is. It's kind of annoying.