Well this is what i read on this one website.
1987: First Supra turbo model is introduced. The intercooled, turbocharged engine boosts hp to 230 and torque to 246 ft-lbs. Other unique features of the turbo are an engine oil cooler and integrated rear spoiler. The sports package, which is standard on the turbo and optional on the base model, offers limited slip differential (LSD), TEMS, and headlamp washers. New Anti-lock Braking System (ABS) available as an option on all models. Besides the Turbo's standard 1-peice spoiler, other visual differences include a boost gauge where the NA's Voltmeter would reside, and a "turbo" badge on the rear of the car.
heres the website:
http://www.geocities.com/ma71supratu...ory/mkiii.html
It tells all about the supra from 1986.5-1992, and the changes in every year. A few of you might find it interesting.