The XJ series boasted increased shield capacity, better maneuverability, and a higher sublight acceleration. The starfighter's weapons carried an increased charge and better targeting computers, making the craft a formidable enemy of the foes of the New Republic. Additionally, a third proton torpedo launcher was added to up the fighter's payload to 9 torpedoes total.[2]
The "StealthX" was in use in 35 ABY during the Killik/Chissconflict. The Jedi tended to use the StealthX or earlier XJ3. The StealthX was a covert strike craft, equipped with features that reduced its visibility both visually and to sensors, though it could be located if it was silhouetted or launching proton torpedoes. The StealthX was described as being smaller than the XJ5 model. The StealthX was also described as being a derivative of the XJ3.
The XJ5 (or "ChaseX") was also in use during the Dark Nest Crisis. XJ5 fighters were used by the Galactic Reconstruction Police. The XJ5 was a half a meter shorter than the T-65C.