I aired out my 1990 Mustang 5.0, but I never had enough road to get beyond 125. Fun, it was!
I’ve gotten my ‘91 Miata up to 115 once. And that was all she had! The car still felt pretty stable at that speed, though.
BTW, I was on Interstate 5 north of Willows, CA when I did that. Since then I’ve gotten pulled over on that stretch (doing 83 in a 70mph zone in my wife’s car) and have learned they patrol it pretty heavily, in part because there’s a race track nearby. And coincidentally, when I got that ticket I was on my way there to go through an SCCA licensing school!