I personally don't know anyone who has done that upgrade, but I can tell you something you should take a look at. The Team Rush Upgrade. If you search this sit you will find many references to it. It will upgrade your inferior antiquated stock system to a very powerful newer system. And are you sitting down? It is cheap too. Compare the prices for it to the Mopar and see which comes out better.
I would venture a guess that 1/2 of the people on this board are using this upgrade one their AMC engine(there are variants for the 258 I6 and the AMC V8 engines). Most of those people not using the TR upgrade have the new 4.0L, chevy, ford, or other engine. Do this and you will not be disapointed. Ask questions here.
Also, do everyone else a favor and fill out your profile. We can answer questions much better if you know your current Jeep set up. Take a look at everyone else's profile's to see what we are looking for.
<font color=green>----------------</font color=green>
<font color=green>llll '90 YJ</font color=green>
<font color=green>"There are no shortcuts to any place worth going."-Anon.</font color=green>