No I can't! Do you guys find it even remotely funny that you can't find this information? c'mon!
I'm paraphrasing:
Here is how, I tried to explain it. The gtx2867 does spool faster and it should, It does make the same power at a higher boost level, it does use the same turbine housing.
If, I have to run more boost, is it an upgrade to the GT2871r?
The new forged 11 blade design makes it a more effiecient turbo.
This was probably the response of a lowlevel employee, but whatever!
My hands are tied, just test it for yourself, but be real! MHO, it's not worth the money to upgrade from a gt2871r 56 trim.
PS I had a big whiny, crying post of how, and why I couldn't post the info!