it was a scaled down stoneage Bburago, and very, VERY simple in execution.
I had several of these, what striked me was the single visual difference to the Bb base: these odd outwards facing exhaust trumpets.
What the heck Mattel??

I changed the wheels to incorrect but finer 250LM HW wires, straighened out the exhaust, and added roundels – and a former scale 18 boarder provided me with tire letters.
I chose a Sebring version to have a reason to cover up the toylike headlights.
Then I gave up.