I started a bit of an obsession with Hot Wheels after I got a small setup and a couple of cars for my birthday in 1969.
For Christmas, I got the Grand Prix layout
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It had dual/dual Superchargers that sat at the center of dual figure-8 tracks.
The last time I set it up was in the mid-90s for my two sons. Neither one was particularly impressed.
That particular layout was devilishly hard to fine tune. I don't think I ever got through a 100 lap race without cars sailing off into space.