That big charger moves some Air. I think it's an 87mm comp wheel. Maby there is a physical restriction. I got rid of my hybrid because te 12cm housing was way to restrictive up top. Knowing what I know now. I would have severly modified the waste gate, and or rigged up an external gate to relieve some drive pressure. Plus I got an offer on it I couldn't refuse. If I get a new turbo from e.d I'm definaly porting the housing and my exhaust manifold. Maby even exhaust ports on the head. All I didn't was change top turbo and hot pipe. And now I have thesehigh egts. And this hotpipe is a lot beter than my last one so I know that's no issue

I know this is old but maybe this will help. I put a 97 12V in my Nissan Titan and was running 3.73's wth 41" tires and I was doing like 850* running down the road. I have changed out the gears to 4.56 which is the correct ratio and EGT's dropped to 600ish running down the road now! if it's not geared right it will be like pulling around a trailer all the time. I had all the mods. in my sig. when I did the cummins swap, so the only change was the gear ghange to get the reduced EGT's. Hope this helps!

That might help, but the deal is before he swapped the 35/40 hybrid for the Super 40, EGT's were not a problem, so there is something else causing it to run hot also.

did you put bigger injectors in or anything fuel related

No, I followed this for a while, and as far as I know, the turbo swap was the only thing that changed, otherwise the problem would have been more apparent.