What is the Maximum Size Implant That Can Be Placed Safely Behind the Muscle for Silicone Memory Gel?

Hi there,
Generally, I believe that implants should be chosen based on a patient's anatomy and the implant dimensions. If you are interested in a more unnaturally large breast contour, certainly larger implants could be placed, as long as you understood the aesthetic outcome likely, and the longer term risks of implants that are larger than recommended, such as the risks of skin thinning and stretching (requiring a subsequent breast lift procedure).
In this case, the limitations would be the expansibility of your skin and the upper limit of implant manufacture. The largest readily available gel implant is filled to 1000cc, but a larger one may be custom made.

The largerst silicone implant made by the company that I personally use is 800 cc. And that is the memory gel. Now there are companies out there that custom make implants as well.
As far as how large one person can go strictly depends on the patients body habitus, measurements and so forth. So impossible to tell how large you can go without an exam.
As far as silicone and saline equivalent, you are right a cc is a cc. It also depends on what time of implant, some have more projection than other given a set cc. So what may appears larger may simply be that the saline implant may have had more projection than the silicone implant, which may be wider.
Hope that helps.