Duramax Turbo

[Kenova]

I came across a GM press release extolling the improvements on it's Duramax Diesel. It may be of some interest to those who would like to scrounge up a turbo(s) for a cheap turbo motor. This is some of what it said:

"When mated with the Allison 1000 Series automatic transmission, the new engine produces 310 horsepower at 3000 rpm. Even more dramatic is the improvement in it's pulling power - torque has been increased by 85 to a class-leading 605 lb.-ft. at 1600 rpm."
" The key to this performance improvement is a variable nozzle turbocharger that has a series of adjustable vanes that direct the exhaust gases into the turbine blades. Sophisticated electronic controls use engine oil pressure to open or close the vanes, which varies the amount of boost pressure."

I know that these turbos have been around for a decade or two and probably aren't seen or heard of much because of the cost involved. Their use on production engines may make them more available. The big question on my mind is their potential. If one of these turbos can move enough air to churn out 605 lb.ft. of torque at 1600 rpm on a diesel, how much power and torque could they pump out on a gas engine?
Does anybody have an educated guess?

Ken