Some people are happy with a particular “upgrade kit” from one of the various Perentie aftermarket mobs, others are not happy with the kit.
Some options that people have fitted themselves are Holset HX30W, Holset HE221W, Garrett TD04 or TD05, and various other turbos.
One particular place that comes to mind that has an very good reputation for turboing Perenties is Momentum 4x4 at Wauchope in NSW.
Generally most people would be looking to upgrade the clutch at the same time as they’re doing the upgraded turbo setup, otherwise it’ll probably be a priority immediately after the first time you tickle the accelerator pedal...