98 duramax turbo on a 1st gen
#3
the 6.5 turbo (not a duramax-they didn't come out til 2001) only makes like 7lbs of boost, so no i don't think you would want to try that just because the 1st gen one is better, and to get any 2001-later duramax turbo to work you'd need a stand alone vane controller for it being as it's a variable geometry turbo gonna probably be more work than it's worth to get it running correctly
#7
the 6.5 turbo (not a duramax-they didn't come out til 2001) only makes like 7lbs of boost, so no i don't think you would want to try that just because the 1st gen one is better, and to get any 2001-later duramax turbo to work you'd need a stand alone vane controller for it being as it's a variable geometry turbo gonna probably be more work than it's worth to get it running correctly