The Renault 4 were once 'hats' salesmen. The company (je) Autobleu made intake manifolds with adapted carburation to make those trolleys a little braver. That went very well. That is why we started with a bigger dream job: making your own car. Based on an R4. I do. The 'production' started around 1953-1954
The tuned power source supplied 25 instead of 18 pk. The manufacture of the dream was far too expensive. Renault has tried something with it. But after about 60 copies, the flames went out. Autobleu stopped in 1958 as a car manufacturer. And started making money again from intake manifolds ...
Yet it is a shame that so few are left