This Pontiac Grand Prix GTP is rocking both a turbocharger and a supercharger, force-feeding the humble V6 to throw down with 530 horsepower at the wheels.

The GTP version Pontiac Grand Prix wasn't new for the 1997 model year, but the 240-hp supercharged 3800 Series II V6 with 280 lb-ft of torque was a new addition, replacing the 215-hp 3.4L V6 with ...

These days, a four-year-old Grand Prix seems to be worth a little less than half of what it cost new. Base versions are going for about $10,000 to $11,000, while a loaded V8 GXP is in the $14,000 ...