OBD1 is only up until 95, 96 was the first year of OBD2 although it is less 'strict' than the OBD2 in the 5gens. In the 96 OBD2 i know you can run a test pipe, with the 5gens you normally can't. I never heard of the JDM ECU working in a 5gen, i'm not so sure they're compatible. However, plenty of folks in here have successfully done the OBD1 conversion on their 5gens.