ST Suspensions ST XA Coilover Kit

2011–2023 Chrysler 300 / Dodge Charger Sedan 3.6L V6 & 5.7L HEMI RWD

Part #: 18227019

Overview

The ST Suspensions ST XA Coilover Kit is a precision-engineered suspension upgrade designed specifically for the 2011 through 2023 Chrysler 300 and Dodge Charger Sedan Rear-Wheel Drive models equipped with 3.6L V6 or 5.7L HEMI engines. This coilover kit offers enthusiasts the ability to finely tune their vehicle’s ride height and damping characteristics, delivering a perfect blend of aggressive styling and enhanced handling performance.

Whether you want to lower your vehicle for a more commanding stance or adjust the suspension for improved road feedback and cornering stability, the ST XA coilovers provide a versatile solution that balances sporty dynamics with everyday comfort. Built with durability and precision in mind, this kit is ideal for drivers who demand reliable performance on the street and occasional track use.

Key Features

The ST XA Coilover Kit incorporates advanced technology and high-quality materials to deliver superior suspension performance and adjustability:

• Wide ride height adjustment range: Front lowering from 1.2 to 2.6 inches, rear lowering from 1.4 to 2.6 inches for customized stance
• 16-click adjustable rebound damping allows precise tuning of ride comfort and handling response
• Durable composite spring perch made from friction-optimized polyamide with embedded stainless steel insert to prevent corrosion and ensure long-lasting strength
• Galvanized zinc-coated steel struts provide enhanced corrosion resistance and extended component life
• Integrated dust protection system and elastomer bump stops safeguard piston rods and internal components from dirt and moisture
• Progressive spring rates front and rear for balanced ride quality and improved performance
• Factory preset damper settings tested on KW shock dynos to guarantee consistent quality and performance
• Mono-block guide system and multi-layered sealing package ensure reliable damping and smooth operation
• Hand-built in Germany by KW experts, backed by a 5-year limited warranty with unlimited mileage

Construction & Design

The ST XA coilovers are crafted with meticulous attention to detail using premium materials and advanced engineering techniques. The spring perches utilize a wear-resistant polyamide composite combined with a stainless steel insert, effectively preventing corrosion and thread damage while maintaining structural integrity for smooth, reliable ride height adjustments.

The strut housings are galvanized and zinc-coated to resist rust and environmental wear, significantly extending the lifespan of the suspension components. Piston rods are protected by a multi-layered dust protection system and elastomer bump stops that act as dynamic load limiters, preserving ride quality and durability even under demanding driving conditions.

Installation & Fitment

This coilover kit is a direct-fit upgrade for 2011–2023 Chrysler 300 and Dodge Charger Sedan Rear-Wheel Drive models with 3.6L V6 or 5.7L HEMI engines. Installation requires no modifications, as the kit replaces factory suspension components while maintaining compatibility with original mounting points. Note that vehicles equipped with the Electronic Damper Control (EDC) system are not compatible with this kit.

Each kit includes a detailed damper setup manual to assist with initial adjustment and future tuning, enabling users to easily reset to factory-recommended settings or customize suspension characteristics to their driving style.

What's Included

• Front and rear coilover struts with progressive springs
• Adjustable composite spring perches with stainless steel inserts
• Elastomer bump stops with integrated dust protection
• Detailed damper setup and adjustment manual
• All necessary hardware for installation

Ideal For

The ST XA Coilover Kit is perfect for Chrysler 300 and Dodge Charger Sedan owners who want to enhance their vehicle’s appearance and handling without sacrificing daily drivability. It suits enthusiasts seeking precise suspension tuning for spirited street driving, occasional track days, or achieving a refined, aggressive stance. Its adjustable damping and ride height make it versatile enough to accommodate a wide range of driving preferences, from comfortable cruising to sporty cornering performance.