Here are the results from swapping the 2015 turbo onto our 2011 test truck. Results were exactly as expected but it is still fun to see the actual data on a dyno graph. This is still on stock 2011 fueling, stock intake/air filter, etc. This is just a 2015 turbo, ******d, and tuned truck.
Peak Torque went from 1194tq @ 1770rpms to 1207tq @ 2070rpms
Peak Horsepower went from 480hp @ 2580rpms to 534hp @ 2790rpms
So we lost about 300rpms of spool up, but gained a peak 13tq and 54hp.
If you look at the dyno graph below you can see that there is more power all throughout the RPM band once you get above 1900rpms. So it may have only gained 54 peak HP but there is a lot more power under the curve. Truck is a blast to drive and is easily driven in the sweet spot so the extra lag is not terrible. Truck also cleans up the fuel to basically nothing once the turbo spools, it does start to get a descent haze in the upper rpm band when the 2015 turbos starts to run out of air, but from about 2100-3000rpms it runs SUPER CLEAN.