$150.00 sounds a little bit expensive. It is true to keep your on Star you have to do some special wiring.
The wiring for onstar uses you factory radio to hear what is being said. So they will need to bypass this and direct wire some little speakers. Like under you dash or something. It won't be as loud. If you don't use onstar it won't be an issue. Also, you can still use it they will only hear you and you won't be able to hear them (unless you install the little speakers like I said above.)
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