PAC integrates the chime module into their kit, Metra does not. I'm not sure if your car has the radio integrated into your car's computer or not (the newer theftlock system) but I can tell you if it is so, then you need the PAC because it will keep your RAP feature and you won't have to tap into the ignition wire to get a switched constant.
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2̶0̶0̶3̶ ̶P̶o̶n̶t̶i̶a̶c̶ ̶G̶r̶a̶n̶d̶ ̶A̶m̶
1994 Olds Cutlass Supreme
2̶0̶0̶2̶ ̶C̶h̶e̶v̶r̶o̶l̶e̶t̶ ̶C̶a̶m̶a̶r̶o̶
1996 Infiniti G20
1993 Chevrolet Lumina Z34
1989 Buick Regal Limited
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