2004 Bonneville GXP Competitive Comparison Product Training – The 04-05 GXP edition was the ultimate Bonneville, at least in the FWD series and certainly the most technologically advanced of any Bonneville. Also the first model by Pontiac to include a GXP edition as Pontiac later introduced GXP editions of other models. Given the development cycle of a next generation, I suspect that by the time the Bonneville GXP was being introduced, it had already been decided that 2005 would be the final yea