I do not know about the Indianapolis but I do know that when the Becker Trafficpro is installed in a Boxster a pin in the plug for the back of the radio needs to be changed. The factory CDR220 triggers the amplifier through a certain pin and the Trafficpro triggers it through a different pin. I bet your new radio needs a pin switched around to trigger the amp. Search the forum for Trafficpro installation to see what I am talking about. If no info here then google it. I know I found it when installing the Trafficpro in my old Boxster 8 or 9 years ago. You will probably need a diagram of the pinouts on the Inianapolis as well.
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