I dont know about N/A cars but OBD1 has a less agressive program for boost then the OBD2. Jotech has proven 20whp gains off just a OBD1 ECU in a Turbo TypeR. I have the OBD1 in my car (got it just preping the car for the Turbo) and it by its self didn't feel stronger at all. Matter fact with the TypeR ECU I use to rev to 8777rpm(via VAFC) vs the GSR OBD1 which has never let me touch anything over 8222 rpms. Its been like learning how to drive the car all over again. I hit that dam rev limiter aaaaaaallot since I put the ECU in but I've gotten better....I guess a shift light would come in handy....