u can turbo sc, or vtec. add as many tranny coolers as u want. the thing is Ur tranny is designed for a passanger car, and engine output of 140 hp. Small cars dont have auto transmissions like u see in Giant american Boats from the 70's. I can put money on it, if you drive ur car hard with boost or SC, that extra 50-100 ponies with toast ur tranny!!.
go 5speed, manuals are built much stronger, and arent as sensitive as auto's!. If u still want big power from an automatic, i say trade ur teg for a Nissan Maxima, or accord V6, or if u can get a GSR auto, that isnt bad either.