Content Type: Gaming Guides
A lot of the Nervous System implants focus on time dilation triggers. Just like Sandevistan Operating Systems (which also focus on time dilation) these require a certain number of points in your Reflexes Attribute.
At a certain point all Nervous System augmentations begin to require 8 in Reflexes or more, but some are still available without Attribute requirements in Common and Uncommon rarities.
(2 slots available)

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Do I Need Nervous System Cyberware?
With two slots sitting around empty, you are right to be trying to take full advantage of the category even if you do not have a high Reflexes Attribute.
At the bare minimum, any build should be able to use Nervous System augments up to Uncommon rank in Kerenzikov (time dilation is a useful skill in battle, and Kerenzikov has its advantages — no cooldown!), up to Uncommon rank in Synaptic Accelerator (an okay addition to the time dilation collection), up to Uncommon in Neofiber (base Evasion increase), and a Common Reflex Tuner (has a cooldown, but comes with a solid time dilation effect to allow you to quickly heal yourself and take a hiding spot). For any build, something like a combination of Uncommon Kerenzikov and Common Reflex Tuner can provide a useful defense tactic in any close-range encounters.
Of course, builds with a high Reflex Attribute have the first dibs — Kerenzikov and others only provide higher and higher bonuses as the rank goes up, and with points in Reflexes augments that allow for airborne dodge and increased duration of Sandevistan and Kerenzikov (Synaptic Signal Optimizer) are available.
Nervous System Mods
There are no mods available for Nervous System Cyberware.
Where Can I Look For Nervous System Cyberware?
You will find the majority of Frontal Cortex Cyberware in Octavio’s Clinic (Arroyo, Santo Domingo), the unnamed Arroyo Ripperdoc, and the unnamed Ripperdoc in Japantown (Japantown, Westbrook).