I'm interested in silicone implants larger than 800ccs. Is this possible in the US?

I agree, saline is not the answer. I am one of the surgeons involved in the Motiva Trial, which unfortunately concluded enrollment for primary and revision breast augmentation in March of 2019. Their implants go up to 1050 cc, and I have a patient that went from 685 cc to 1050 cc and is very happy. It is expected that they will be granted FDA approval, but no one knows when. My best guess is in the next 2-3 years. You can wait, or go to another country to have the surgery. 

Thank you for your question regarding what to do with your breast. I would suggest the implants that both implants be removed. Yes, it is time to change your breast  implants. I would remove your old implants and go with a bigger size. I also believe you would need to change the breast pocket and might require a breast lift. The amount of breast lift will be determined by the size implant you choose and elasticity of your skin. You may require either a doughnut mastopexy, lollipop  mastopexy , or possibly a full anchor mastopexy.  The maximum size of silicone breast implant in the USA is 800cc.  Thank you for your question regarding what to do with your breast implants after 17 years.  If you have any more questions regarding the breast lift or mastopexy, capsular contracture, or breast implants in general, please contact my office.  Since your breast surgery is somewhat complex for an average plastic surgeon, please seek an experienced, board certified plastic surgeon with significant experience performing these types of breast lifts. Do your research.  Make sure your chosen plastic surgeon has performed at least 100 breast lifts.  Make sure they have the before and after pictures to prove it.  Carefully examine their before and after pictures and check their reviews on RealSelf.  Good luck! Sincerely, Dr. Katzen. (“Verified” Plastic Surgeon , Certified by the American Board of Plastic Surgery, Fellow of the International Society of Aesthetic Plastic Surgery, American College of Surgery, International College of Surgery, and American Board of Metabolic and Bariatric Surgery,  and member of the American Society of Plastic Surgery, American Academy of Cosmetic Surgery and RealSelf Hall of Fame.)

For now in the US, 800 cc's is the maximum limit for silicone gel implants. Saline can go somewhat larger. However, larger is not always better, especially with large heavy implants.