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1993 Pontiac Firebird Trans Am, LT1 5.7L V8
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The answer will likely vary with the audio package offered with the vehicle, which can be gleaned by looking at the Service Parts Identification label.

The example I am giving is not specific to Firebirds; even in non-amplified vehicles, some cars offered what was called an "Extended Range" option for speakers that carried four ohms of resistance. Base-level speakers of the day carried anywhere from eight to ten ohms.

Do you have the original speakers in the car?
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