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I would rather hands down do the cp3 swap. It’s a very reliable pump and has been proven in previous years. It is just used to move fuel and ramp up pressure so that’s why no tuning is required just like injectors. Put them in and go! I understand the thoughts of using the cp4 but IMO I wouldn’t do it. Even if you are not looking to make more power it is just a solid pump. More money yes be we all drive diesels and some as in me have 2. Everything is expensive but you need to put good reliable parts in them to get the life you want out of it. I did this conversation for my buddy in his 12 Duramax and he is glad he did it. While we had things open we did bigger turbine wheel and cover. He has his deleted and tuned so it did make a big difference right away.


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So why do so many CP3 conversions say they require tuning? And why does S&S seem to have the only kit available that doesn't require tuning?

I've got a mini max right now, and about to fix the EGR and exhaust systems...Would that tuning be sufficient, or would the CP3 require more extensive tuning or a different type of tuner altogether?
From what I gather the cp3 that require no tuning have already been set to stock parameters for mostly stock applications. If you plan on building the truck for more power then get one you need to tune. You will be able to get more out of it I believe.

I am not sure on the tuning for the pump. You would have to ask tech support on that. I would think it will require a separate tune.


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