Fitment Information Infiniti Q50 RWD 3.7 (2014, 2015) Infiniti Q50 RWD 3.0t (2016,  2017, 2018, 2019, 2020) Premium/Signature/Luxe Chassis code:  V37 Specs & Features Lowers: Down SUS (N122D): ~1.0" to 1.2" Front and ~ 1.0" to 1.2" Rear Super Down SUS (N122S): ~ 1.8" to 2.0" Front and ~ 1.8" to 2.0" Rear Spring Rates: Down (N122D):  Front 8.76 kg/mm Rear 3.67 kg/mm Super Down (N122S): Front 8.93 kg/mm Rear 3.67 kg/mm True Japanese heritage from the JDM market Performance spring with comfort in mind Includes all 4 springs Designed to work with stock shocks Product Description True Japanese lowering springs. RS-R is one of the top aftermarket spring manufactures in Japan and is proud to bring their technology to the US.  These authentic JDM lowering springs provide you with both comfort and performance while giving you the lowered stance and much improved handling characteristics that you look for in a lowering spring.  RS-R takes careful consideration of the vehicle these springs were designed for to ensure the factory suspension geometry, shock dampening, spring rate and right height levels are designed for your specific vehicle to give you the best performance and control possible.