200cc Silicone Breast Implants for Petite but Muscular Frame?

It all depends on how much breast tissue you have now. 200cc will make a small, but modest difference if you have very little breast tissue. If you're looking for an improvement in you breast shape without anyone noticing, this would be the way to go. If you do want people to notice a larger breast size in you, consider larger implants. Good luck!

It is a small implant, but it sounds like you are very petite also. It will make a difference yes, but it all depends on what you are looking for. You will likely be one cup larger, perhaps a 32B. You are always best to stay within the confines of your breast and body to avoid issues in the future. Going behind the muscle will prevent the implant from distorting during work outs and when moving your pec muscle, but if you have very thin skin and no breast tissue then it will make the implant very apparent. Just something to think about, either position you go for, in front of the muscle or behind has its drawbacks for you.
Good luck.

Most of my patients are conservative and do not want to look too big or un-natural. My patients try on the implants (we have sample sizes in the office) and find a size range that they find aesthetically pleasing. I then give my advice based on measurements of their chest and the implants dimensions. This allows the patient to select the size based on their aesthetics. You should try on the 200cc implants and see how they look on you.
Since you are thin and muscular, I would suggest placing the implants under the muscle. Even though many feel that silicone implants do not cause rippling, I have seen this happen especially in physically fit women. Going under the muscle may cause the implants to move when you flex but the rippling that can occur when placing the implants over the muscle can happen just from moving a certain way or leaning forward. Neither is perfect but I would recommend under the muscle. Good luck.