Thanks to modern workshops, you can slap a turbo on pretty much anything. Just depends how deep your pockets are.. Go Pro, you'll need new exhaust headers and gaskets and rings and ecu... and more
Yes you can ,I have done it only the other direction(98 to a 91). You will have to switch seat tracks to accomadate seat belt buckle.
Yes.
Yes.
As far as I know you can not get a subaru legacy sti from the factory bu you could get an sti engine and put it in a legacy. That is the only way that I know of.
a non-turbo engine will not hold up to the turbos you will have to put in hardened internals
Yes, you can turbo anything.
If you are referring to a turbo on a subaru then the oil is fed by a from the engine and as far as im aware this is the case with all turbos i know of
put on a turbo
my husband says yea
4g63 (Turbo) or 420A (non-turbo)
yes
For the right price you can put a turbo on just about anything. Unfortunately for you the cost to put a turbo on a non-turbo eclipse is probably more than going out and buying an eclipse with a turbo already on it.