haha awesome question, first … what do you mean by performer ? what is the car performing ? drift ? drag ? etc -
if it is drag go with the cheapest, lightest chassis, they are basically identical once you start adding parts, s13 may be cheaper to source used parts but really its the same,
drift im sure they are both good, but cheaper is usually better,
and for weight - why ? why lose so much ? does it need to be a full interior’d car ?
more info is really needed to answer these questions dude… seriously …
strip interior and inner skeletion out, remove rebars ? safe i dont know lol, cage it, cut the inner fenders, shit like that. … but how serious are you ?