My Bad...
"The WS6 option pack is a balanced combination of engine and suspension upgrades. It gives a Formula or Trans Am the raw power of the muscle car era with contemporary braking, suspension, and safety technology. The most apparent WS6 feature is a functional hood scoop. That ram-air intake and other modifications help the engine to produce 310 horsepower. Four-wheel antilock vented disc brakes, a heavy-duty specially-tuned suspension, and 275/40 ZR17 tires on alloy wheels ensure that stopping and cornering abilities are in line with the increased power."

But still lets see the RPO code.