Found on another site, Awesome review just had to post it here too:
All results found with this truck setup:
98 2500 QC SB 12v 5sp
Amsoil Air Filter System, Fluidamper, 5" exhaust, 0 plate, 22*, GSK4, AFC spring, 435 EDM's, ARP studs, O-ringed, HTT
64/14 & 3pc manifold, SBC
Con OFE, traction bars
So there has been quite a bit of discussion over which injector is bigger and better. But nobody that I have seen had real life results. So I bought both sets of injectors and am here to tell you. Your welcome...
At idle, 435s would haze steady, wouldnt ever seen to clear up. DDP4s would haze for a minute and then its clear. Hard to tell if the trucks running when I cant see the smoke out the stacks! The DDP4s would also cool down quicker than with the 435s.
At cruising speeds, 70mph. 435s ran about 775 to 800 on the pyro, DDP4s ran about 650 to 700 on the pyro.
At WOT, the DDP4s spool faster and the temps dont build as fast. In fact they seem to level off at about 1500. The 435s would keep going. 0-120 would get me too 1500 on the DDP4s. The level of smoke from the DDP4s is quite a bit less too. It smoked a bit until the turbo lit, but after that, it ran pretty clean. The 435s would leave a pretty good haze. Boost went from 48psi with the 435s to 51psi with teh DDP4s.
Mileage, usually got around 13 to 14 with the 435s. Havent filled up yet with the DDP4s yet, but should be soon.
Dyno, I did 518 on #2 with the 435s and will find out on the DDP4s in March. But the seat of the pants dyno noticed a big difference. Even the girlfriend noticed it too.
All the results are at 1300 ft elevation at below zero temps. Its been dang cold around here. Also I took out the .022 DVs for the testing too. With the DVs and 435s I was running 56 psi and smoked a ton, all the time, whether you were trying to or not. I will put them back in as soon as I get some good mileage numbers. Also will have some good dyno numbers with them in and out too.
So far, I am very impressed with the performance and quality of the DDP4s. Seems to be a great product and money well spent. The 435s are a great budget injector that got me some good power and some smokey fun for the pesky rice and tailgators, but if your looking for that last bit of power or wanting less smoke and better mileage, the DDP4s are the winner here.