The 2005 and 2006 models packed a 6.0L LS2 V8 engine with tons of grunt. In the horsepower department, the Pontiac GTO 6.0 engine doesn't disappoint: it clocks in at 400 horsepower, with 400 lb-ft ...

Prices shown for the used 2006 Pontiac GTO Coupe 2D with NaN miles are what people paid to buy this vehicle or what people received when trading in this vehicle at a dealer. Edit options.

a faster 6.0-liter LS2 V8 engine was added, offering a whopping 400 horsepower, an increase of 50 from the previous year, and 395 lb-ft of torque, an increase of 40. A new dual exhaust system (split) ...