Description
Coil-Over Shock Kit - Pro-Coil - Twintube - Single Adjustable - Front - 550 lb/in Spring Rate - Ford Fullsize Car 2003-11 - Pair
QA1 03-11 Ford Crown Victoria Pro Front Coil-Over System - Single Adj. - 9in x 550lbs/in - Aluminum
QA1 Pro Coil Systems for 2003-2011 Crown Victorias are a great option for anyone looking for fully adjustable ride height and valving control. Choose a spring rate and adjustability that fits your driving style, adjust the valving to match, and you are on your way. These shocks also utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling. QA1 Item number MS431-09550
Additional Information
Front Pro Coil single adjustable stock mount shock kit. Includes 9" spring with rating of 550 and a flat end.
Part Type
Coilover Set
Product Overview
QA1 Pro Coil Systems for 2003-2011 Crown Victorias are a great option for anyone looking for fully adjustable ride height and valving control. Choose a spring rate and adjustability that fits your driving style, adjust the valving to match, and you are on your way. These shocks also utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling.
Data: v2 - Desc: v4.2 - Upd: 2026-11-08 13:43:29
Features
- 100% Dyno Tested and Serialized
- Easy, bolt-In Installation
- Lightweight Billet Aluminum Coil-Over Shocks
- Made in the USA
- QA1 Item number MS431-09550
- Ride Height Adjustable
- Serviceable and Rebuildable by QA1 Authorized Service Centers
Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.
Specifications
Product Details
| Active or Passive Suspension: | Passive |
| Adjustable Compression: | Yes |
| Adjustable Rebound: | Yes |
| Adjustable Ride Height: | Yes |
| Assembled: | No |
| Brand: | QA1 |
| Description: | QA1 03-11 Ford Crown Victoria Pro Front Coil-Over System - Single Adj. - 9in x 550lbs/in - Aluminum |
| Grade Type: | Performance |
| Internal Construction Type: | Dual Tube |
| Manufacturer Part Number: | MS431-09550 |
| Part Number: | qapMS431-09550 |
| Remote Reservoir: | No |
| Spring Color: | Black |
| Spring Material: | High Tensile Chrome Silicon |
| Title: | QA1 Shock Absorber and Coil Spring Assembly MS431-09550 |
| UPC: | 806990159915 |
Reference Information
| Reference Data (Provide these details to our support team) | |
|---|---|
| Brand Name/s | Qa1 |
| StreetFX SKU | qapMS431-09550 |
| SFX Item ID | 4094932 |
| Accounting SKU | qap-MS431-09550 |
| Manufacturer SKU | MS431-09550 |
| Manufacturer UPC | 806990159915 |
| Alternative References | MS431-09550, QA1-MS431-09550, QA1MS431-09550 |
Coilover Kit, Pro Coilover System, Front, Single Adjustable, Ford, Pair
QA1 Pro coilover systems are engineered from the ground up to offer unmatched performance over stock suspension setups. Pro coilover systems utilize adjustable and non-adjustable coilover shocks and springs designed specifically for replacing the factory shocks and springs. This combination offers ride height adjustment and variable position valving adjustment (where applicable) for performance not found in other kits. Choose QA1 Pro coilover systems for your next suspension upgrade.
| Product Attributes | |
|---|---|
| Brand | QA1 |
| Manufacturer's Part Number | MS431-09550 |
| Part Type | Coilover Kits |
| Product Line | QA1 Pro Coilover Systems |
| UPC | 806990159915 |
| Coilover Kit Position | Front |
| Adjustable Valving | Yes |
| Number of Valving Selections | 18 |
| Shocks Included | No |
| Internal Design | Twin-tube |
| Coilover Springs Included | Yes |
| Spring Rate (lbs./in.) | 550 lbs./in. |
| Gas Charged | No |
| Upper Mount | Bracket |
| Lower Mount | Eyelet |
| Shock Body Material | Aluminum |
| Shock Body Finish | Silver |
| Spring Finish | Black |
| Crossmember Included | No |
| Adjustable Mounting Bracket Included | No |
| Hardware Included | Yes |
| Welding Required | No |
| Quantity | Sold as a kit. |
| Notes | Coilover shocks are single adjustable MS431 shocks. Springs are 9 in. 9HT550 springs. |
Compatibility
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