4-5K 5 being the high side the newer the better 03- if i remember correct the first versions had less power and a couple bugs that mitsu worked out.

don't forget about the DID 4d56HO pretty strong engine nothing like the old idi's
http://www.new-pajerosport.com/gene/en/productinfo/performance01_03.php

89 2 dr turbo diesel
89/88 "Backwoods sas"