1. B16A2 = USDM 99-00 Si

2. A "JDM" B16A second generation found in 96-00 SiR's and SiRII's were all stamped B16A. The only way you can tell it is a 2nd gen is the extra OBD2 sensors/equip.

3. VTEC controllers will do you NOTHING on a factory motor japan spec or not. If you want to set the VAFC or VTEC controller to give you the best power gains, take it to a chassis dyno and have them tune the extra 2-3 WHP gains there. Nothing worth paying extra money for unless you have upgraded your cams or have done internal work to your motor.

4. Have a nice day.