Alright, picked up a 89si and it had a new b20a5 motor put in about 7 months ago(got the paper work) and the previous owner said that the trans was not shifting right, motor was having a hard time cranking up. Well it orignal had a b21 and I was wanting to know if the problem was because you needed to have a different ecu or something. and I;m about to get a new trans because the idoit took out the old one and threw under his pourch when the problem might have been something else, but just wanted to know if I needed to pick up a ecu