PIO: The code “PIO” stands for Performance Image Option. In other words, if your Mustang has this code on the tag, it’s a true GT (Gran Turismo) model. GTA models were known for their enhanced performance features and sporty styling. So, congratulations on having a GTA?
1967 Fastback Mustang it has a buck tag, which lists the equipment beyond what is on the data plate It clearly has “PIO” on the tag, which translates to “Performance Image Option (GT).” So, yes, this is a real GTA.
If your Mustang Fastback has the GT>A package, it would be the PIO code stamped on the factory-installed “buck tag.”
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