Progress Tech CS2 Coil - over systems are non - adjustable dampers manufactured to our specifications. These twin - tube low pressure gas systems are available in a wide range of spring rates tuned for daily drivers, street performance and your perfect weekend - warrior drag or track day ride. If you're on a tight budget and you're looking for a great system for an unbeatable value, a CS2 kit is just the ticket. With no fancy knobs or big bling,