jpvdh

Hey guys im just looking for some info and your thoughts between the 2004 and the 04.5 cummins. What are the differences? Pros and cons of both. And what you would rather run and why. Lets get into it here. Drivetrain fuel systems exhaust ect.
thanks

Spooler

Do a search, alot of info on it that has already been discussed.

06RAM2500

I'll help save you the time.

04.5's went to an electronic waste gate control, upped the horse power to 325, and the injector nozzles are at a different spray angle.

tantruck

Check your PM's, I sent you a good link for info.


The 2003 and early 2004's only had 2 injection events per combustion cycle and get a bit better mileage that the 2004.5's and later. The 3rd injection event on the 2004.5 and up was for emissions and it also turns the oil black much quicker, ( not really anything to worry about but it annoys many folks.)

However, the 03/04 were rated for a bit less HP, either 255hp for the SO motor or 305hp for the HO motor and they did not have a cat converter like the 2004.5+. Some of the 255 hp motors got the 47RE auto trans while the 305hp I think got the 48RE trans with some upgrades.

The 2004.5+ had 4 inch exhaust a bit larger turbo in stock form.

Just a couple of things that come to mind.

SOhappy

04.5s also had catalytic converters, well....stock from the factory anyway.

ironbrew

So... when we go to order injectors, we order for an 05, and when we order other parts, such as a raptor fuel pump, again we order for an 05?

jpvdh

Yes.

Little Joe

You can't run 04.5-07 injectors in 03-04 engines. The piston bowl is not the same and injectors have different spray angle.