Actually I decided not to upgrade. The GTX2863r is an amazing turbo, quick spool like the GT2860r, but top end is similar to a 2871r, I can see these things doing 700whp for sure.
With that said, the GT2860r is still a great turbo for our engine, the .64 can do close to 600whp, the .86 is probably good for 650 (Sam claims they did 611whp with the stage 1) which is really more than I will ever want. If I had a built engine capable of running higher boost safely I would probably run the new GTX series just to have the bragging rights/dyno numbers
