Videos on youtube of people who have gutted their tesla and shaved off a few hundred pounds, but any benefit you gain is killed by the crazy inconvenience. One of the reasons the roads here in the US are getting chewed up, though, is that most cars weigh like double what they did in the 90s. Not something thats easily resolvable on the road maintenance/pothole issues plaguing many places. Nonetheless, there are some people who are into amateur and pro racing who are actively doing conversions, probably right now.