if i swap my 3sfe engine for a3s-ge engine do i need to swap ecu and tranny also what else do i need will exhaust pipe be the same

The ecu wouldnt need to be swapped. the 3sfe and 3sge both use the same ...................bout all the info i can give ya for now..............

??? Are you sure about this? I'm pretty sure that there is a 3sge and a 3sfe ecus are different. If anything, I would say that you can use the same transmission, as they are the same S-series block.