2015 powerstroke 440hp/860tq

msjdbman wrote:
Word on the GM truck forums is that the Duramax will see an update in 2017 to around 445 hp and 850 torque. I guess time will tell, as always.

IIRC, the 6.6L Duramax is maxed out in tuning for power / emissions ratio. Isuzu built a great diesel engine, no need to play the leapfrog game.