If you decide on a cummins in the 03 to early 07 you will need to do something about the fuel filtration. It sucks due to it let's large particles get to the cp3 and the injectors. I'd recommend a air dog or fass lift pump. If you plan on chipping it or doing bigger sticks with a bigger turbo later down the road the upgraded lift pump will handle the extra fuel needed, otherwise the water separator/ 2 micron filter will save your injectors. Another thing is (and I'm not sure where you live and what the emissions laws are there but in 07 1/2 they switched to the 6.7 and with that came the dpf (diesel particulate filter). That is a piece of shit. You can't idle your truck when it's real cold due to I will plug up and it's a huge bottle neck for your exhaust. I personally have a 2000 with the VP44 pile of junk and the 47re that I dropped $4500 for upgraded and billet parts to make it bulletproof up to 650hp. Other then the tranny taking a shit at 82,000 I love the truck.
TON!
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