In comparison, the E60 BMW M5’s record lap is 8:13. That car starts at $85,100 and betters the G8 GXP by 92 HP. The Porsche Boxster S is two seconds slower than the G8, despite weighing over 800 Lbs less and retailing for $15,700 more. So basically, the G8 GXP gives you the performance of a Porsche Boxster S and the practicality of an M5 with the price tag of a Pontiac. If you haven’t already, make sure you check out our Pontiac G8 GXP First Drive.