The Street II includes all the bits in the Street I and adds Pedders Gas SportsRyder dampers at all four wheels. The G8 delivers with oil and air basic dampers from Monroe Australia. They are acceptable units on most cars, but the G8 should have delivered with gas charged struts all around for improved control. Pedders GSRs are nitrogen charged twin tube dampers tuned for greater control. The G8 arrives sitting rather tall, especially in the rear, so the Street II includes a we drop the ride height from 660mm with 19? wheels to 640mm front (.8? drop) and 620mm rear (1.5? drop) with slightly higher coils rates. With the foundational bushes from the Street I kit, increased alignment range including front castor adjustment, GSR struts and SportsRyder lowering a Street II improves all aspects of the G8 driving experience. Everything we make for the G8 keeps that in mind. It should drive like a European sedan that costs three times as much -- but keep the passenger compartment comfortable for the longest trip. You'll find you GSR damped, SportsRyder spring and bushed G8 to do that and more. Ride quality is more composed than OE and the handling is excellent.