Pulling behind other trucks

[Running rough]

Yes it defiantly moves more air then the stock turbo, I noticed my oil temps are slightly cooler with the 871 turbo to, probly due to it not have to work as hard and spin as fast, definitely more higher and midrange power, however you can still feel the torque rise as rpms come down under 1400 in a pull, not sure if it is his tune or just the 2250 inherit ability to make tighter torque as when compared to say a 871 or 870, granted stock they are notting special (the 2250 I mean, cummins stock Cals are kind of droopy on lower rpm torque but their 2050 torque stock tune is a lot better then thier 1850, there are more gains to be had if u go the @m*m^2 rout, with mpg torque response ect, if you choose to keep the stock turbo, my opinion, it is good for 2050 torque and 600 hp max, it probly will not quite make u 600 hp but it will make u 2050 lbs in the lower rpms, that's my experience, but it does not light a candle to what uni has in my truck now with the bigger turbo,