My point was Performance in power on the first year cars. The GTO was a in a whole different Power class than the Mustang
Mustang can take credit for the Pony car race.
The GTO started the Muscle car era.
A hard thing to do since GM banned anything making more than 1 hp per 10 LB because the US Government was going to break GM up over having such a large part of US vehicle sales. Delorean broke the rule but GM let it pass and because of that,
The GTO preceded every GM A Body performance or Ford and Chrysler intermediate Performance car that came after . That also qualifies as starting a Super Trend.
ps. Still think it was a mistake to name a 4 door EV SUV a Mustang.
Maybe should have been a New Futura