You're saying that you dont think banks will stand behind their engines? What exactly do you see that looks like a potential prob issue? the attraction of the duramax is lighter weight, better fuel mielage , more torque and a higher rpm range than the cummins. that makes them attractive to a performance boater looking for an alternative to gas. (ie : for something like a 36-40' cat application) What are your thoughts on 2 speed trannies/drives for this app?