TEIN Flex Z Features: Twin-Tube System Considering the use of larger tires/wheels and the lowered ride height, FLEx Z uses twin-tube system, in pursuit of ride comfort on streets. In order to maintain the ride quality on streets with rough spots here and there, a shock absorber has to have sufficient stroke, be low-frictional and move smoothly. As an oil chamber and a gas chamber are not arranged serially in a twin-tube system, it is easy to secure enough stroke. Also, low gas pressure keeps friction low. Its smooth stroke movement makes it possible to follow rough and bumpy road surfaces quite well, offering supple ride at low speed and stable ride at high speed. Full-Length System for Ride Height Adjustment w/Minimal Change in Ride Full-length ride height adjustment system, used for FLEx Z, enables adjustment of ride height by adjusting the case length, without changing the damper stroke length and/or spring pre-load. This has the advantage that the change in ride quality is kept minimal when the height is adjusted. This not only makes it possible to maintain a good balance between the low-down appearance and ride comfort but also provides more setting choices for sport driving as well. Damping Force Adjustable to Change Ride to Desired Settings FLEx Z has ever-popular 16-level damping force adjustment (comp./rebound together) feature with the use of needle valve. By turning the adjustment knob, damping force (stiffness) is adjusted linearly step by step, to change the ride and handling of the car to suit driver's needs/preferences. Use of well-reputed "ADVANCE Needle" at the needle valve for oil flow control secures sufficient damping force adjustable range. Compatible w/EDFC Series With EDFC (Electronic Damping Force Controller) series installed, damping force can be controlled from the cockpit with ease. Stepping motors attached in place of adjustment knobs control the damping force quickly and accurately. Use of EDFC turns 16-level adjustment into finer 32-level or 64-level adjustment mode (64-level only available with EDFC ACTIVE / EDFC ACTIVE PRO), to provide the optimum performance by fully utilizing the damping force adjustable range drastically widened by the use of "ADVANCE Needle". With EDFC ACTIVE / EDFC ACTIVE PRO, damping force can be controlled automatically according to changes in G-force and/or vehicle speed, to offer a very smooth and slick ride like never before. Some models are NOT compatible with EDFC series. Fitments: Lexus GS300 GRS190L 3000 FR 2006 Lexus GS350 GRS191 Base Model 3500 FR 2005.08-2012.01 Lexus GS350 GRS191L 3500 FR 2007-2012 Lexus GS430 UZS190 Base Model 4300 FR 2005.08-2007.10 Lexus GS430 UZS190L 4300 FR 2006-2007 Lexus GS450H GWS191 Base Model, Version I, Version L 3500 FR 2006.03-2012.01 Lexus GS450H GWS191L 3500 FR 2007-2011 Toyota Crown Athlete ARS210 Athlete G-T, Athlete S-T, Athlete T 2000 FR 2015.10-2018.05 Toyota Crown Athlete GRS180 Athlete 2500 FR 2003.12-2008.01 Toyota Crown Athlete GRS182 Athlete, Athlete G Package 3000 FR 2003.12-2005.10 Toyota Crown Athlete GRS184 Athlete 3500 FR 2005.10-2008.01 Toyota Crown Athlete GRS200 2.5Athlete, 2.5Athlete Navi Package 2500 FR 2008.02-2012.12 Toyota Crown Athlete GRS204 3.5Athlete, 3.5Athlete G Package 3500 FR 2008.02-2012.12 Toyota Crown Athlete GRS210 Athlete, Athlete S, Athlete G 2500 FR 2012.12-2013.11 Toyota Crown Athlete GRS210 Athlete, Athlete S, Athlete G 2500 FR 2013.12-2015.10 Toyota Crown Athlete GRS214 Athlete S, Athlete G 3500 FR 2012.12-2018.05 Toyota Crown Athlete Hybrid AWS210 Athlete, Athlete S, Athlete G 2500 FR 2012.12-2013.11 Toyota Crown Athlete Hybrid AWS210 Athlete, Athlete S, Athlete G 2500 FR 2013.12-2018.05 Toyota Crown Hybrid GWS204 Base Model, Standard Package, L Package, G Package 3500 FR 2008.02-2012.12 Toyota Crown Royal GRS180 Royal Extra, Royal Saloon 2500 FR 2003.12-2008.01 Toyota Crown Royal GRS182 Royal Saloon, Royal Saloon G 3000 FR 2003.12-2008.01 Toyota Crown Royal GRS200 Royal Saloon 2500 FR 2008.02-2012.12 Toyota Crown Royal GRS202 Royal Saloon G 3000 FR 2008.02-2012.12 Toyota Crown Royal GRS210 Royal, Royal Saloon, Royal Saloon G 2500 FR 2012.12-2018.07 Toyota Crown Royal Hybrid AWS210 Royal, Royal Saloon, Royal Saloon G 2500 FR 2012.12-2013.11 Toyota Crown Royal Hybrid AWS210 Royal, Royal Saloon, Royal Saloon G 2500 FR 2013.12-2018.05