perhaps worth bringing up here is the citroen 2cv i somewhat similar car to the beetle (although front engined and originally intended as a true ofroad vehicle)
if you want to race it, you need to make it look like this
when citroen modernised the car's ecterior and created the dyane, it looked like this
but if you want to race it you must turn it into this:
if you google 2cv racing you'll find tons more of these modifications