Cybernetic Synchronisation actually doesn't work with the in-game cybernetic implants; the perk was added long before the implants were even conceived, and I think the devs might have just forgotten about it. If it is ever re-worked to account for the current in-game cybernetics, it'll probably work for all of them equally.
As for the implants themselves, you can have two of them: one combat and one utility. Combat implants affect combat stats, and are:
- Cybernetic Subprocessor: +10 Intelligence, -5 Reflexes
- Sensory Dampener: +5 Willpower, -5 Libido, -5 Aim
- Steroidal Muscle Augment: +10 Physique, -5 Willpower, increases Tone over time
- Muscular Stabilisation System: +10 Aim, -5 Physique, reduces Tone over time to 50
- Reflex Tuner: +10 Reflexes, -5 Aim, reduces Thickness over time
- Combat Tail: grants an extra drone that deals kinetic damage and replaces your current tail; can be used in conjunction with other drones
- Breed'N'Brute: +10 Physique for 2 hours after performing penis-in-vagina sex
- Ballistic Breast Liners: +4 Defence, flat increase to breast size
Note that changes to core stats also change the maximum of those core stats by the same amount. Utility implants are highly sexual, and are:
- Synth-Womb: increases incubation speed (mother) by 800%, grants a toggle to change fertility between 0, normal and +400%, ignores all other forms of infertility and contraceptives
- Ecstasy Enlargers: increases breast size to DD, each orgasm increases breast size by 1 for four hours (multiple orgasms stack the size increase and reset the timer), Libido also increases a bit during this time
- Prostitute Pro: converts any loads received in the cunt into energy, prevents vaginal pregnancies
- Lactation Inducers: increases lactation upon taking cum in the mouth or ass