I'll say it...
EFI Live is the best tuning suite for the D-MAX and gas HANDS DOWN!!! Take for example HPT doesn't offer DSP switchable tuning for the d-max or offer COS for the gassers.
Ask around on dieselplace.com
dieselplace is probably the biggest resource online for the D-MAX. I'm not saying that are a lot of geniuses over there, and you have to take what you read on that forum with a grain of salt. But for the most part it's a pretty decent place to learn stuff.