There is no upgraded CP4. There is the MPROP upgraded filter to apparently prevent the grenade carnage from going further than the pump itself.

 

Exergy makes an improved stock CP4. Is this as strong or better than a CP3 of any kind? Stock or built?

 

I had my CP4 swapped out and downgraded to CP3 just last month. I haven't noticed anything different except my mileage between regens have increased as well peace of mind and reliability for this truck. Not really sure of increased mileage between regens is a good thing or not. They did have to retune my Motor Ops tuner.

 

I had a Fleece in-tank lift pump installed by the awesome folks at Carolina Diesel Performance and stopped worrying about it.

 

I have already added a lift pump to my truck but no matter what I was planning on CP3 swapping it. But if these improved CP4's are a better route I will just do that and save 2 grand.

 

I'm a little confused. I thought Exergy made a FPR that limits the amount of damage to the whole engine should the CP4 fails and throws parts all over the engine. I put one of those Exergy FPRs just for peace of mind until I decided to just remove the CP4 and replaced it with the CP3 for better peace of mind. I can't find anything about a CP4 that exergy makes on their website.

 

I believe you are correct as to what the Exergy upgraded filter does. To protect the rest of the fuel system from shrapnel if the CP4 was to destruct itself. Cheap insurance if it does what it claims.

 

When you compare the design differences between the CP3 and the CP4, for the money spent, to me it looks like a no brainer to go with the CP3. There are even upgraded versions out there of the CP3 to get higher rail pressures/volume. Dean

 

I think this what I will end up doing. I will have to find a good reputable EGR delete kit to finish my delete so I can install the CP3 but I think that's what I will do. Probably a Fleece PowerFlo 750 kit and Exergy 60% over injectors. My trucks already been deleted and tuned I will just need a re-tune when the time comes to do all this. Probably an EZ Lynk system.

 

Delete tune? 🤐

 

Previous owner did it to the truck so now I guess I do too.

 

I don't know what will happen in the future but delete tuners are all going emissions compliant now.. If you need new delete tunes I wish you good luck.
Look outside the US.

 

Hey guys, I'm new to the group and have been asking the same questions as you all have. I have found some good info and will post links to video explanations below. As far as the Exergy CP4.2, WehrliCustomFab put it best. While it has the beefed up FCA/MPROP and a redesigned cam lobe to increase stroke within the pump, it is still a CP4.2. Seriously check out the links below for the in depth analysis. My biggest take away is that the CP3 was a superior design, albeit, sending less fuel pressure to the rails than the CP4, but much less prone to failure. If you go to the S&S Diesel website though, they have CP3 that are rated for higher pressure. It seems like a no brainer to go with the CP3's reliability. Also, I read somewhere that the Cummins ran CP3's all the way up to 2019...food for thought. Cheers!

Video Explaining the design difference of the CP4 and the CP3:

S&S CP3 Conversion Kit Explained:

DMAX Store CP3(S&S) Conversion Kit install: