Ok here's the lowdown on the WS6 and Firehawk series taken from
WS6 and Firehawk Q: What's included in the WS6 performance package?
A: The package was available starting in 1996 on Formulas Trans Ams only. Included in the package were:
Ram Air hood and air intake (like that of the Firehawk)
The 1998s and up WS6s have a completely new hood with 2 functional intakes right above the standard non functional nostrils
Freer flowing exhaust system
Higher rate front springs (360 lbs/in)
Variable rate rear springs (130-180 lbs/in)
Stiffer front and rear shocks
Harder bushings
Larger diameter front anti-sway bar (32mm)
Increased cooling
17 inch wheels with 275/40ZR/17 tires
Firehawk - available as an upgrade to the Formula model starting in 1993. The package include a functional ram air hood scoop and reworked exhaust manifolds (starting in 1995) resulting in 305 HP and 335 ft-lbs of torque (300 HP and 325 ft-lbs prior to 1995). An optional freer flowing exhaust system brings HP to 315 and torque to 342 ft-lbs. The stock wheels and tires are replaced with 5-spoke 17" ZR-1 style wheels with 275/40ZR/17 tires. Hurst shifter and floor mats were available options starting in 1995. Bilstein shocks, stiffer rate springs/bushings, and a larger front sway bar make up the optional Level-II suspension which was an available option starting in 1996 along with a Torsen differential, up-level (Trans Am) spoiler, fog lamps, and car cover (all separate options). "Firehawk" badges replace the "Formula" badges on the front fenders and rear bumper. Badges are also added to the front-lower doors. Stickers showing the HP rating were placed on each side of the hood scoop from 1993 to 1995. All cars were shipped as stock Formulas to Street Legal Performance (SLP) Engineering where the above modifications were made through 1997. After that, GM made the modifications on its own assembly line. Production is limited: 1993 = 250, 1994 = 500, 1995 = 1,000, and 1996 = 500. Twelve 1994 Trans Am GTs were shipped to SLP as pilot cars and were equipped with the Firehawk setup, of which two are 25th Anniversary convertibles and three are 25th Anniversary hardtops. Some of these pilot cars also had headers installed bringing them up to 325 HP (although it's more like 340 HP). Because of late production (est. 7/98) the Firehawk was not available as a 1998 model, but as a 1999 model.
Firehawk/LT4- available only in 1997 with all of the standard and optional Firehawk equipment, but the LT1 was replaced by a balanced and blueprinted LT4 engine with 330 HP. Additionally, they got a new stainless steel exhaust and exhaust manifolds, and a new Bilstein performance suspension set-up. The cars had to be special ordered with a 6-speed transmission, and no T-tops or convertible, and they were then sent to SLP for modification. Production was limited to 100 cars.
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