This Godspeed air suspension system does not come with a controller. You will need to use an existing or a new air management system with this kit Fitment Information Infiniti Q50 Sedan RWD V37 (2017, 2018, 2019, 2020, 2021) Front Fork Type Specs & Features Monotube Shock With Anodized Finish Shock Body 32 Levels Of Rebound Damping Settings High Quality Rubber Air Bags With Stainless Steel Fittings Aluminum And Carbon Steel Hardware 52 MM Shock Body For Thick Performance Piston Race Spec Shock Oil With High Viscosity Index Factory Style Mounting For Simple Bolt On Installation Works With Most Air Management Systems On The Market(Sold Separately) Kit Includes 2 X Front Air Struts Assemblies 2 X REAR Air Struts Assemblies Tool Kit Including Spanner Wrenches And Damping Adjustment Knobs Product Description Godspeed Project's Mono-AIR Suspension Strut Kit includes both front and rear struts that works with most air management system out in the market. Mono-AIR features mono-tube shock with 32 stages of rebound damping adjustments that allows you to control suspension return to proper position rapidly or slowly depends on driving condition. High quality rubber air bags are used in replace of springs that allows easy ride height adjustment, stainless steel fittings included. Due to the importance of rubber air bag role in the suspensions kit, high quality rubber material are used to withstand from drying out and cracking result in longer life when compared to cheap rubber material. Godspeed air struts are designed to be easy installation that should requires no modifications to your car or parts.