I used a Walbro pump again because of great results with them in the past. There were no mods necessary. I basically unbolted the old one, and put this one in its place. Its the easiest one i've ever fitted

I bought it from Automotive Service Solutions (used to be called petroject) in brisbane and it came with a filter kit to fit the Pajero. It was only about $190 trade and is reported to support up to 500hp. My engine is currently around 450hp+ to make those dyno numbers and there is no probs with fuel delivery or pressure.....yet
The EMS is by far the most easiest ECU to install and tune that i have dealt with to date. There is no need to ever send them back to the dealers for reconfiguring when change and injector type or something like some ecu's. They have worked on absolutely everything we have tried them on. We have used Motecs, Wolfs, Autronics, Microtechs, Apexi's and i still believe, IMHO, that the value for money and ease of use of EMS beats all the others. If you have any specific questions to ask about it, fire away. You can check some info on EMS's webpage too.
www.fuel-injection.com The Stinger 4 is about all you'll ever need and costs just over $1k