one, you can swap a b series in a first gen. two, then have been making si's before 88, my parents had an 85 hb si. three, turbo and supercharger is possible, ive just never seen it done. i do agree though, get a new car, something with a better base to start with, like a 92-95 hb cx. and if youre THAT worried about weight, why would you want an si model anyways, since they are the heavier of the models.