I have a 1991 Celica ST with the 4AFE engine. I want to swap the engine out. I have my friend to do the work for little pay. Cha-ching! I want to put a new tranny on as well but I want to keep it automatic. Does a 5SFE engine fit in with no problems? Would I need to get a different tranny? If anyone could show me to a guide of doing this would be great as well. Thank you very much for your help I know you all must be sick of this question. I've also seen 4AFE turbo kits on ebay, are they worth it?

hopefully 91CelicaST is still around, he knows gobs about the 5th gens.

the 5sfe wont bolt into an st. if i were you, id look into a 20v 4age or a 4agze.as for the turbo kits, its ebay, you can never know.