QA1 MS431-09550 Pro Front Coilovers System 9" for 03-11 Ford Crown Victoria

Vehicle Fitment

• 2003-2011 Ford Crown Victoria (all trims; RWD; front coil-over application)

Features

• Fully threaded aluminum body allows ride-height adjustment
• Single-adjustable valving for tuning compression response
• High-travel design with 9" spring for increased wheel travel
• 550 lb/in spring rate balances performance and daily drivability
• Twin-tube shock layout provides consistent damping
• Lightweight billet aluminum components reduce unsprung weight
• Dyno-tested for consistency and durability
• Fabricated and assembled in the USA

Specifications

• Part Number: MS431-09550
• Spring Rate: 550 lb/in
• Spring Length: 9" high-travel coil
• Shock Type: Front twin-tube coil-over, single adjustable
• Body Material: Anodized aluminum
• Height Adjustability: Yes, via threaded body
• Warranty: Standard 1-year (limited); lifetime on select shocks
• Position: Front, left and right installed as a pair

Included Components

• 2x MS431-09550 front coil-over assemblies (left + right)
• 2x pre-installed 9" 550 lb/in coil springs
• All necessary hardware and installation instructions

Product Description

The QA1 MS431-09550 Pro Coil-Over System is a direct-fit upgrade for 2003-2011 Ford Crown Victoria front suspension. Designed with a threaded aluminum body, it offers ride height adjustability for stance or clearance needs. Equipped with 9" high-travel springs rated at 550 lb/in and single-adjustable damping, this coil-over balances comfort and performance for street and light performance use.

Manufactured in the USA and dyno-tested, the MS431-09550 features a twin-tube shock design with lightweight billet aluminum components to reduce unsprung weight while delivering durable, consistent handling. Backed by QA1's warranty, it's an excellent choice for enthusiasts seeking improved suspension performance and customization capability.