

In the end, only a few squadrons were equipped with x1's. Some also feared that hyperdrive-equipped starfighters would facilitate defections. Privately, some Imperial Navy strategists admitted that the Navy was afraid to purchase a fighter with a hyperdrive, fearing that it would give bureaucrats an excuse to slash orders for new capital starships. The Empire, however, decided not to order the TIE Advanced x1 in large quantities, citing their excessive cost. Armed with the references of a pleased Darth Vader, Sienar then presented his x1 to the Imperial Navy for mass distribution. Sienar and his team rose to the challenge and eventually presented Vader with the TIE Advanced x1 model. Wishing to cut all ties with his Jedi past after his fateful duel, Darth Vader contacted Raith Sienar with a set of specifications for a new starfighter. For best performance, the targeting system of the x1 required frequent adjustment in combat. The target tracking system was also more sophisticated than the already formidable advanced targeting system on standard TIE craft, used to overcome the extremely powerful electronic jamming used by all combat craft to defeat target lock in battle. In addition to its shields, it had a modest Class 4.0 hyperdrive but no life support systems. The TIE/x1 had twin heavy L-s9.3 laser cannons in a fixed, front-mounted position, as well as a cluster missile launcher.

While less maneuverable than standard TIE fighters, it was more resilient in battle. Speed was only slightly improved due to the added mass of the vessel a good deal of the extra power was bled off to the deflector shield generators. The x1's most important innovation was the use of "bent-wing" solar array wings, like those used on the TIE/sa bomber, which had the advantages of increased surface area for more power while also reducing the craft's profile, compared to the TIE/LN starfighter's hexagonal panel wings. However, the x1 had an original spaceframe, with an elongated rear deck and reinforced durasteel-alloy hull. The TIE Advanced x1 featured a Sienar Fleet Systems solar ionization reactor and paired twin ion engines like the original TIE Fighter. Only the most elite Imperial pilots flew the TIE Advanced, and the starfighter was capable of fighting a T-65 X-wing starfighter to a draw. Further development of the Advanced continued, eventually leading to the TIE Avenger and TIE Defender.

While it never made it into production, many of its best design features were later incorporated into the TIE/sa bomber and TIE/IN interceptor.

The TIE Advanced x1, or TIE/x1 was an advanced prototype starfighter researched as a replacement for the standard TIE Fighter.
