I am not a pro so u might choose not to listen to mee. I am doing a research on what alarm I want to get so not so long ago I read an article about alarms that are coming out next year and some company is planning on making plug and play alarms that will plug in directly in to your cars wiring. So you might whant to wait/ research more about that.
Also my friend had grand charokee and he had 3 remotes. The 2 original remotes had a coolest features they would adjusts your seat depending on which remote out of two you are useing. 3rd remote was maybe viper and it was a remote start. You are risking to loose that function(seat adjustment) intalling a completly new one. How ever if you do enough research and some electrical work I am sure you can wire a new one and keep all the old functions.


Edit: Article I read, not the most technical but hope it will help http://twice.com/article/CA6268433.html
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98 Stock Talon ESi
Mods: New spark Plugs, and UDP
I know spark plugs are not a mod but the car runs so smooth now.