Kas already essentially said that yes, upgrades were outlawed, but that rule wasn't retroactive. Meaning that previous R&D upgrades (i.e. Elite, TNO's Anti-Intrusion System, etc.) aren't effected.
More importantly, why do you care?
[size=1]"So the woman asked me what I wanted on the sandwich and I said I do not care it is for a duck, and she was like oh then it's free. I was not aware that ducks eat for free at Subway. It's like give me a chicken fajita sub, but don't worry about ringing it up, it is for a duck.”
-Mitch Hedberg
[/size]