370Z/G37 SOLID Series Aluminum Subframe Bushings (SSB) replace the stock mushy rubber bushings on your Nissan 370Z to eliminate free play of the sub-frame relative to the chassis. This prevents the subframe from "bouncing around" under drive-train torque or suspension load, maintaining optimum suspension geometry and reducing wheel hop. Our slide-in shim system allows you to quickly raise or lower the subframe to fine-tune the roll center/anti-squat behavior to your preference. Raising the subframe will compensate roll center for a lowered car at the expense of increasing anti-squat. Lowering the subframe will decrease anti-squat at the expense of roll center. Now Formula Drift Regulation Compliant! With the recent regulation change in Formula D, we changed our kits to comply. You can maintain OEM height and be perfectly legal.Our SPL Parts SOLID Series Bushings are precision CNC machined from Billet 6061-T6 Aluminum for an accurate fit. This kit also includes optional rubber isolation washers to reduce noise transfer from the subframe to the chassis. Sold as a set.Made in the USA. Applications: Infiniti G35 (V36) Infiniti G37 (V36) Nissan 370Z (Z34) Installation Instructions: SPL Solid Subframe Bushings