That one was sold on ebay in June 2011 by a dealer (Phoenix AZ) just shy of 70,000 miles at the time.
Here's the mods listed in the auction:
DESERT AUTOSPORT IS VERY PLEASED TO BRING TO THE MARKETPLACE THIS 1989 PONTIAC TRANS AM SPECIAL EDITION. ALSO
KNOWN AS THE TURBO TA. THIS IS CAR #1205 OF 1555 PRODUCED. IF YOU ARE LOOKING AT THIS CAR THEN YOU PROBABLY
ALREADY KNOW WHAT A TURBO TA IS SO I WILL SPARE THE DETAILS. WE HAVE A COPY OF THE ORIGINAL WINDOW STICKER AND
THE PHS KIT FOR THE CAR.
THIS PARTICULAR CAR HAS 69,000 MILES FROM NEW AND HAS BEEN VERY WELL CARED FOR. WE HAVE A THICK BINDER OF
RECEIPTS INCLUDING A LONG LIST OF MODIFICATIONS THAT HAVE BEEN PERFORMED. COSMETICALLY IT IS ALL STOCK AND
ORIGINAL LOOKING AS ALL THE MODIFIACTIONS ARE MECHANICAL. IT HAS THE FOLLOWING UPGRADES:
TA-49 TURBO
ATR 3 INCH STAINLESS STEEL DOWNPIPE
2 1/2 INCH CATALYTIC CONVERTER
3 INCH ATR STAINLESS STEEL EXHAUST
2 1/4 ATR STAINLESS STEEL CROSSOVER PIPE
HIGH VOLUME OIL PUMP KIT
CLOYES TRUE ROLLER TIMING CHAIN
HIGH PERFORMANCE HEAD GASKETS
ADJUSTABLE FUEL PRESSURE REGULATOR
ULTRACHIP PERFORMANCE CHIP
SCANMASTER
FUEL PUMP WIRING UPGRADE KIT
ATR BILLET EXTERNAL WASTEGATE
HIGH VOLUME FUEL PUMP
10MM IGNITION WIRES
160 DEGREE THERMOSTAT
CHROME MAF PIPE
K&N AIR FILTER
CHROME INTERCOOLER TUBE
UPGRADED INTERCOOLER CLAMPS
BILLET TURBO INLET
120 AMP ALTERNATOR
Looked very clean (no damage) in the 2011 pictures I have ... no speakers/amps in the back at the time ... Scanmaster, aftermarket stereo and 3 gauge a-pillar at the time.