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Read more: Every Ford EcoBoost Engine Ranked Worst To Best Prior to GXP, Pontiac's Grand Prix performance model was called the GTP. GTP stands for Grand Touring Prototype, and is derived from an ...

Roomy interior; smooth ride; fuel efficiency on the highway; acceleration (GXP). See the latest and greatest features ... in the GTP model marked the only changes in 1998 for the Grand Prix. In 1999, ...

This designation was featured on select Grand Prix and G6 models with more robust engine output. Pontiac GXP was the performance trim that replaced the GTP and was available on several cars as ...