Originally Posted by gregroot198521
Isn't the only difference the software and the cable though (between SUB-002 & SUB-003)?
No, the "brain" itself is different for each model as well. A SUB-002 is always a SUB-002 once it leaves production.
I think you are confusing V2 and V2B. Those are hardware revisions. SUB-002 is the part number that covers the 04-07 STi. SUB-003 covers 08+ STi.