This Pedders Street 2 kit includes everything that the street 1 includes plus 4 Gas SportsRyder (GSR) dampers. The Pontiac G8 comes with oil and basic air dampers from Monroe Australia. They are acceptable for most cars, but the G8 should have come standard with gas charged struts all around for improved control. Pedders GSR's are nitrogen charged twin tube dampers tuned for greater control. The Pontiac G8 arrives sitting rather tall, especially in the rear, so the Street 2 includes a drop .8"" in the front and 1.5"" in the rear.