What is this vehicle?

For those who don’t know, the Opel Manta was so good that it was banned from SCCA racing in 1975 because nothing else could keep up.

“The Manta's rear suspension was exotic in the day, especially for what was considered to be an economy car in the 1970s. The rigid rear axle is located by a three-link rear suspension, sprung by a set of coil springs, and improved by a Panhard bar and an anti-sway bar. In all, it's a great setup, and one that's remarkably easy to improve. "Basically, a set of shocks and better rubber could easily transform the Manta from a street car to a showroom stock contender," says Bob Legere.

And contend, the Manta did. Until 1975, when it was banned from SCCA competition, the Manta dominated its showroom stock class. Engine power wasn't up to the competition, but handling and aerodynamics made it absolutely unbeatable in those years. In period comparison road tests, the Manta came in second to last, but on the track it won every race it entered.”

That is why I had such a passion for the car. Mine was also worked up to 130 hp In a 2100 lb frame which was wicked back then.

Read...and you may understand why.

https://www.hemmings.com/stories/article/power-to-the-opel-1974-opel-manta