Galen55 came up with the following info.
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TIE/ISB

The ISB unique TIE fighter is a marvel of imperial engineering. Developed parallel to the TIE Defender, the ISB wanted a more sleek version that would be suitable for covert assassinations and travel for the field agents. This craft was rarely seen and commonly referred to as the ‘black angel’ by the few who knew of their existence.


Manufacturer
Sienar Fleet Systems

Line
TIE Series

Model
Twin Ion Engine/ad starfighter

Class
Starfighter

Technical specifications

Length
12 meters

Maximum acceleration
21 MGLT/s

MGLT
170 MGLT

Maneuverability rating
80 DPF

Engine unit(s)
SFS P-sx7.4 twin ion engines (rated 230 KTU)

Power plant
SFS I-s3a solar ionization reactor

Shielding
Forward/Rear projecting Novaldex deflector shield generators (rated 40 SBD)

Hull
Titanium hull with Quadanium steel solar panels (rated 20 RU)

Navigation system
SFS N-s9 Navcon

Avionics
SFS F-s5x flight avionics system

Armament
SFS L-s9.3 laser cannons (6)
SFS M-g-2 general-purpose warhead launchers (4)
4 concussion missiles each

Crew
Pilot

Other systems
Ejector seat
Ration storage (two weeks)

Emergency gear
Ion flares (12)
SE12 pistol (2)
Power packs (30)
Gas cartridge (5)
DC-15s (1)
Power packs (15)
Gas cartridge (10)
Communication suite
Prefab campsite
Additional two weeks rations
Stimpaks (5)
Medkit (2)

Roles
Space superiority fighter
Interceptor

Stats based on the TIE Avenger