p30 is the ecu found in the 93-97 Honda Del Sol Si.which came with the second generation B16athe p30 is obd1 and works for 92-95 civics with vtec.pr3 came in the first generation b16a. which was from 88-91 i believe.so it makes it obd0.now u can also use the p28 found in 92-95 single cam vtec civics to power your b16. chip that p28 and it'll bring your motor to life!the p28 is actually more popular and easier to work with than the p30.