Car alarm question

[TurdFergueson2 5,000+ posts]

I have and Autopage 727lcd installed, but I was looking to get one of the ones that has 1 mile range. I know the brain would have to be replaced, but being that the car is already wired would I have to tear the whole thing out or just replace the modules?

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[SethPhillips 5,000+ posts]

usually all the harnesses should be the same..