@Nino a minor passive stat gain =/= a stat bonus.
The former allows you to increase your stats passively rather than through level up or training, up to their normal maximum, and is ultimately a time saver.
The latter allows you to increase that stat above its normal maximum, providing actual benefits in combat.
Edit: For clarity’s sake, the Breed ’N Brute, Power Boner, & Steroidal Muscle Augment all increase your Physique beyond the normal maximum of 65 at level 13, allowing you to do more damage with any attack using that stat.
The Glute Gains & Protein Power implants, on the other hand, only provide a passive stat gain when cumfilled out of combat, up to the normal maximum, allowing you to waste less time doing stat training in the New Texas Gym.