YX is known as a Borderworld engine... However, the overall effect do not look different than Libertonian XV engines. Actually it is almost the very same effect.
My proposition is to change effect of that engine into something else that would distinguish it from the Libertonian engines. I would vote for an effect around the projectile of the Xeno weaponry (Suntiger/Black Widow) that is bloody dark red. Such a color would be excused by the influence of the Long Range Engines that are usually used by BHG and unlawfuls. Also, some Xeno influence, since for some odd reason Xenos can use Zoner tech and ships.
Edit: CE- YX- and XV- engines, at least Class 1, Class 2 and Class 3, looks a bit too similiar to each other - if they aren't the very same effect though. Every other engine available in-game is very unique, but these are not like that.