RENAULT 4CV R1052 SPORT
The hairy one, with stiffer crank, light alloy head and conrods, dual-choke carburettor and so on. Up to 42bhp available, with speeds in the low 80s. Five-speed crash 'box option 1953, but the few cars sold in Britain were four-speeders. Unlikely to find one that hasn't rusted out, but could be fun if you do.