There are lots of great tuners who are vendors here, or visit the board.
But when a "Who is the best tuna" thread starts, there is a 50/50 chance it will blow up into hatemail.
It's the nature of the beast.
GM's current gas V8 dates back to 1997. Before, it's design dated back to the 1950's.
The Dmax dates back to 2001.
Not sure what the capabilities of the 4.5L are, but it is a far newer design than other GM V8's.