Car-Kit NOX

I have a sticker that says my Car is Nox equipped!?
WhatintheHeck is that?!?! and how do I "Un-Equip" it...

Also I have a "Velocity Stack" Air Cleaner. Does anybody still Run one of these? I would love to get a Hood with a scoop... Or maybe switch to a Dual Cold Air Intake Style Air Cleaner for my Holley 600. Experts?