i know the heaviest of the body styles was the
station wagon,which was something close to 800 kgs.somewhere here will know,so this might be the go.you could always consider a
ca18det,which is under the weight break,& is
smaller than the sr20.lots of people have done them,i know but it just depends if you want to be a bit different,or don't mind doing something similar to other people,& be able to ask for advice if anything goes wrong.