Both the coupe and the sedan models of the 1999 Grand Prix GTP have a supercharged, 3.8-liter, V6 engine that produces 240 horsepower at 5,200 rpm and 280 pound-feet of torque at 3,600 rpm. The bore and stroke are 3.80 inches and 3.40 inches, respectively, and the compression ratio is 8.5:1. It has two valves per cylinder, and a four-speed automatic transmission with overdrive is standard. The Grand Prix GTP can go from 0 to 60 miles per hour in 7.0 seconds.
The 1999 GTP has an anti-lock braking system with discs on all four wheels, including two ventilated discs on the front. The vehicle has rack and pinion steering, a wide track design and stiffer, fully independent suspension. The strut front suspension has a stabilizer bar with coil springs, while rear suspension is multi-link. The GTP has a multi-point fuel injection system, and it has an 18-gallon fuel tank. The sedan gets 18 miles per gallon in the city and 28 mpg in highway driving, while the coupe's fuel economy is slightly better at 19 mpg in the city and 30 mpg on the highway.
The two-door GTP coupe has a curb weight of 3,396 pounds, and the four-door sedan weighs 3,414 pounds. Both models have body side molding, front and rear body color bumpers, daytime running lights, front fog lights, heat reflective glass and a trunk/hatch spoiler. The wheelbase is 110.5 inches. Both models are 196.5 inches long, 72.7 inches wide and 54.7 inches high.
The 1999 GTP coupe provides 110 cubic feet of passenger volume, while the more spacious sedan has 116 cubic feet of passenger space. Both cars seat five people and have bucket seats in front and bench seats in the rear. The driver seat cushion is heated and has a lumbar support. Driver and passenger front air bags are standard. Other features include front and rear reading lights, power locks, power windows and luxury leather trim on the steering wheel and the gear knob. An AM/FM radio with a CD player and six speakers also is included.
