Having a 05 Duramax 2500 in the garage i am interested in the diesel. If they can build s treatable diesels with 1000HP (yes 1000HP) and over 2000lb-ft of torque with a 6.6L and running 10's in the 1/4. You can easily expect to be able to make a 4.5 L make 800HP and 1500lb-ft. While getting hi 20's/low 30's in mpg. Plus they use a compacted graphite iron block that is lighter and stronger than cast iron. And there is no beating the exhaust noise that you can get out of a turbo diesel with a 5in exhaust
. Keep an eye on banks engineering to see what kind of kits and the power they will have for the 4.5L in the near future. One more thing, with Urea injection the air that comes out of the exhaust is cleaner than the air going in and is already meeting 2012 emission requirements.