Adding an inter cooler is fairly easy, it's also one those great mods for power and longevity. If i remember correctly those cj's have a lot of space in front of the radiator.
When inter cooling it's probably worth while to up grade to the d24 intake, it makes life easier.
I would measure how much space you have to work with, then get the biggest inter cooler that will fit. I would run 2.5" size piping, it's easier then trying to fit 3".
I would buy one of the universal inter cooling kits from eBay, they include lots of clamps, couplers, and pipe- should be more then you will ever need.
There will be some special one off reducer fittings you will need, 1.75" to 2.5" 90* turbo outlet and if using the d24 intake you will need a 3" to 2.5" 90*.
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