you can do a torque converter but building up an automatic is very difficult to do. honda AT were not meant to be power houses. do a tranny swap and then you can start off from there. believe me, there are too many people that try to build up their little 1.5L autos to some big dragster. its not going to happen. If you do plan on doing turbo, your motor will not last very long if you stay with the automatic transmission. take my word for it. do what i stated here or above, i have experience in this area. OR, you could always just save the trouble and sell the damn thing and get a 5 spd. your choice bro, good luck