As a newer player in the airsoft realm (my first season) I personally am glad for the 400fps LIMIT set on most of our northern Alberta fields.
I've accidentally pulled the trigger on a player within MED who surprised me and missed, (I didn't) and would've been pretty upset had it done physical damage to the other player more than causing a resounding "$hit that hurt! HIT!"
Really think about why you want to up the FPS limits. Is it because of your epeen to say big numbers? or is it just for extra range...and if its for extra range...really what's happening by increasing FPS limits is increasing the potential for serious harm at closer distances and to me that just doesn't make good or fun play.