CST PERFORMANCE SUSPENSION is proud to announce our 4” STL Suspension System for 2020 GM HD pickups. This all new CSS-C3-23 kit will provide superior performance on and off road. Subframes are designed to give you the most ground clearance and protect vital front suspension components. Laser cut and machined knuckles provide strength and durability. CST Performance Suspension products are designed and manufactured in the USA to the highest standards for quality, performance and durability.