From 1993 to 1997, sole engine for the Formula and Trans Am was the 5.7 L LT1 V8, essentially identical to the LT1 in the C4 Corvette except for more flow-restrictive intake and exhaust systems.
Firebird performance levels improved for 1996, with the establishment of the stronger 200-hp 3.8 L V6 as the new base engine, and the power rating of the LT1 increased to 285 in 1996, due to its new dual catalytic-converter exhaust system. 1996 was also the first year of the OBD-II computer system. Optional performance enhancements were available for each Firebird trim level; the Y87 Performance packages for V6s added mechanical features of the V8 setups, such as four-wheel disc brakes, faster-response steering, limited-slip rear differential, and dual tailpipes.
For Formulas and Trans Ams, functional dual-inlet "Ram Air" hoods returned as part of the WS6 performance package. The optional package boosted rated horsepower from 285 to 305, and torque from 325 lb-ft to 335. Also included were 17" x 9" wheels with 275/40ZR17 tires, suspension improvements, oval dual tailpipe tips, and a WS6 badge. Bilstein shocks were a further option with the package. The 1997 model year introduced standard air conditioning, daytime running lamps (utilizing the front turnsignal lamps), digital odometers, and optional 500-watt Monsoon cassette or compact disc stereo systems to all Firebird trim levels.
Source: Wikipedia (original)