There are a couple in Auckland that have cams done by Henry at Auckland Camshafts Ltd. Not sure the cam alone made a difference, 1 has had head work also, goes very well. Check out https://www.youtube.com/watch?v=3WH4fFb2d8c the truck with the yellow cage.
I had similar question a few yrs ago prior to Turboing mine
Talked to many people and searched this and the Aust patrol forum
the Overall impression was: if turboed - not a lot of gain for $ spent unless your building a high end engine and after the last 1%.
For NA - great gains, http://www.patrol4x4.com/forum/engine-d ... wer-66078/