The KYB Gas - a - just monotube adaptive damper is a direct OE replacement for Lexus vehicles equipped with adaptive dampers and installs easily. It can instantly, automatically adjust to your performance needs and never experiences fade due to aeration. The KYB Gas - a - just has two separate working chambers An air - free hydraulic piston and valve area for responsiveness and control, and a second high - pressure nitrogen gas area with a floating piston that provides a comfortable ride during normal driving and adds instant performance on demand.