2nd that on the PN.
I'm hoping someone has a factory sheet for them but I haven't found it.
Stan Weiss is often referred to as a source. He has them listed at 396.2cc/min (@3bar).
See here
Page18
I think Needswings would be able to set you up with some O-rings if you plan on servicing them. If you consider yourself handy check out Youtube has some good hints on servicing them yourself.
If you search Sweet2002's posts he listed an ebay source for some 550's which he fitted successfully. They were 6 jet and only $240 or soemthign like that.

otherwise if you are thinking of going over 18psi - I'd look at other drop in's
1) 482cc ones BoschPN 0280156304 MB PN 1130780123 or
2) 543cc ones BoschPN 0280158117 - dont have an MB# for these.