Before Post is closed note following which would hopefully be helpful in the Prado power-chip quest:
A. A relevant article on electronic tuning devices for LCs / Prados on the Australian LCOOL tech forum for Toyota owners with conclusion reproduced below: http://www.lcool.org/technical/elec_diesel_tuning/tuning.html
"As stated up front, with the advent of electronic control of diesel injection systems, a plethora of tuning devices have been released on the market to tempt the Prado and Land Cruiser performance enthusiast. Let's face it, a chip is a chip isn't it?
On the face of it, all promise improved performance however as is plainly seen from all of the above, there is a huge leap in going from a simple overfueling device to a sophisticated plug in computer system with comprehensive fuel map, independent timing map as well as built in safety features.
The cost of these units on the other hand is not necessarily relative to their features or capabilities. For example, simple overfueling devices installed between the ECU and the injector pump can cost between $600 - $1300. It could be argued that, given that these devices are very simple and inexpensive to develop and manufacture, the retail price is geared more towards preying upon consumer ignorance rather than technical merit.
LCOOL members should now be in a position to better evaluate the variety of options for their Prado or Land Cruiser and to ask more relevant questions rather than relying simply upon quoted power and torque figures. In fact, these very figures which may have at first been the most significant criteria to the LCOOL member, are ultimately the least important, for all devices will deliver an improvement. The important criteria are those that are used to determine which devices deliver the best improvement in engine performance across the entire RPM range and throttle range, fuel economy and engine protection at a reasonable cost."
B. A relevant post on Toyota Diesel Forums with the following recommendations:
"....This is how to make a 1KZ-TE sing;
1. 2.75" exhaust from tail pipe to turbo - replace the cast dump housing too!
2. clean up the induction system as much as possible - including the inner of the air filter box.
3. fit an intercoller - front mount is by far the better option
4. fit a Diesel Tuning Module - see below
1 & 2 will get the turbo to spin up a bit quicker, but not make a lot more power - dont use crappy foam filters on a turbo engine.
3 will add reliability by cooling the air
4. will really bring it to like -
Thats what I did anyway, and I'm pretty happy with the result."
C. A good article on a 2000 Prado being chip tuned, also in the super-diesel land of Australia with the following end results: http://autospeed.com/cms/title_Prado-PowerUp/A_108982/article.html
"The Prado turbo diesel responds incredibly well to the fitment and thorough tuning of the UniChip interceptor. Every way you look at it, a 19 percent power gain for just under $1400 drive in-drive out is a bargain! Beyond the extra power found through the UniChip, David suggests the next possible mods for the Prado include increased boost pressure and a high-flow exhaust. An upgrade intercooler would also be a good idea. With these mods, it's suggested another 15-or-so percent more power will be achieved."