Im new here so please dont flame me for this, butdo some dothe duramax conversion with the $35-40k price tag? Is it for increased power, fuel economny, engine life etc?
Thanks

 

some just want it because they can. They love their truck and don't want to get a "new" truck for whatever reason - or they want to do it themselves.

You get more power and better fuel economy. Harder to work on, difficult to integrate into the truck and adds complexity for many things.