YSR Pro Sport Digressive Series Coilovers - Acura RL 1996-2004 (KA9) fits_2006-2015`Mazda`MX-5 Does not fit vehicles with

Does not fit vehicles with all wheel drive drivetrain or SRT-8 models

reduces back pressure

Naturally-aspirated model only

2014–2019 Porsche 911 (991) Turbo S

YSR Pro Sport Digressive Series Coilovers - Acura RL 1996-2004 (KA9) fits_2006-2015`Mazda`MX-5 Does not fit vehicles withFRONT REAR SPRING RATES 14k 8k UPPER MOUNT Aluminum w Hardened Rubber Bushings Aluminum w Hardened Rubber Bushings The Pro Sport Digressive Series Coilovers from YSR USA are designed to provide motoring enthusiasts with exceptional handling characteristics while maintaining a balanced ride comfort. Digressive valved coilover systems are designed to provide a stiffer damping force at low shaft speeds while allowing for more fluid movement at higher