If I had to guess, I would say they are there to tune the exhaust, much like tubular headers. I am guessing the reproductions don’t have it because of the expense. Maybe someone with more knowledge on this will chime in.
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1970 Trans Am
1971 Trans Am
1974 Trans Am
1978 Y88 Trans Am W72/auto
1979 10th Anniversary Trans Am
1984 Trans Am
1993 Trans Am
1999 30th Anniversary Trans Am
2001 10th anniversary Firehawk #104
2006 GTO
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