turboing the 5SFE is nto worth it.
i installed a JSpec 3sgte into my 1991 mr2 NA.
get a rear clip and go from there. that is the easiest thing to do.
www.speed-source.net
do a search on the board for my name and a thread about 2 years ago for the swap info. (about 500 posts and 3 threads long)
by the way, i am brandonthomas91 on the mr2 boards.