Deciding on 545cc silicone submuscular implants, do I need a lift as well? (photos)

I appreciate your question.

From your photos, it does not appear that you need a breast lift.  Augmentation alone should give you nice volume restoration.
The best way to assess and give true advice would be an in-person exam.  Please see a board-certified plastic surgeon that specializes in aesthetic plastic surgery.  

Best of luck!    

Dr. Schwartz 

Board Certified Plastic Surgeon

#RealSelf100Surgeon 

#RealSelfCORESurgeon

In agreement with Drs. Sieber and Pousti, judging from your submitted photo, you 'll not have "saggy torpedos," but nice full round breasts with augmentation alone, no formal breast lift required.  Difficult to be 100% sure of anything without in person examination, but the 545 ml volume of your chosen implants is less important than the dimensions (width and projection) in determining what type of final result to expect.