No, the B18C (SiR-G) is the Japan version of the american b18c1 (GS-R) motor. I believe the only difference is 10:6 compression on the JDM version, as USDM b18c1 has 10:1. BTW i forgot to state that ill use the obd2 harness -> obd1 ECU convertor.... HMotors online sells the LSD for $300, and some places say the complete engine & tranny comes with LSD. Not sure if this is correct info though. Some websites are very misleading....