As a general rule, the size of intramuscular buttock implants rarely can exceed more than 350 to 400ccs at most. The intramuscular space is much more limiting than the subfascial location. (above the muscle0
The size of the implant depends on your body frame. I need to make measurements to tell you what is the largest implant that will fit you best, safely. Having said this implants go up to 600-700 cc but will require a large from to fit an implant this size. a combination with fat injections can be done to achieve a larger volume.