I am wondering if going with an implant that is 2 cm smaller than you measure is going to cause any issues?

I know many factors are taken into consideration when choosing an implant size and profile, but I am wondering if going with an implant that is 2 cm smaller than you measure is going to cause any issues? I am wanting to go with a more augmented look and to go with a higher profile I either must pick a HUGE cc implant size or go with a smaller base width than I measure.