Apart from weight savings, WHY?? you have to mod and tune the crap out of it to make good power on the 1.9L. The 2.0s are much more expensive and involved but make better power. The 1.9s make a lot less power and torque than a 4.0L. Its a cool idea, is pretty good in something like a samurai that is very light, but it doesnt make a lot of sense in an XJ. I looked into them for a long time before I settled on a 5.3 which I paid a lot less than $5500 for all the parts of my swap and it makes like 3x the hp and 2.5x the torque. If its just for a trail rig I think it would work pretty nicely but if you plan to drive it on the road it will probably be pretty disappointing. Get a late 90s 3.0 turbodiesel merc motor instead, those can blow your socks off.
