QA1's Front Pro Coil System for the Ford Crown Victoria delivers fully adjustable ride height and valving control. The single adjustable shock uses a fully threaded body that sets the ride height for the desired stance and helps fine tune weight balance for improved handling. The kit includes a 9 inch 550 lb spring with a flat end.
Specifications:
- Type: front Pro Coil coil-over system
- Adjustment: single adjustable
- Spring: 9 in, 550 lb rate
- Spring end: flat
- Mounting: stock mount, bolt-in
- Part number: MS431-09550
Vehicle Applications:
- 2003 Ford Crown Victoria
- 2004 Ford Crown Victoria
- 2005 Ford Crown Victoria
- 2006 Ford Crown Victoria
- 2007 Ford Crown Victoria
- 2008 Ford Crown Victoria
- 2009 Ford Crown Victoria
- 2010 Ford Crown Victoria
- 2011 Ford Crown Victoria
FAQ
What vehicles does this QA1 Pro Coil system fit?
It is designed for 2003-2011 Ford Crown Victoria applications listed in the vehicle applications section of this listing.
Is this coil-over system adjustable?
Yes. It uses single adjustable valving and a fully threaded shock body for ride height adjustment.
What spring is included?
This kit includes a 9 in, 550 lb rate spring with a flat end.
Is it sold individually or in pairs?
QA1 Pro Coil systems are sold in pairs and include all mounting hardware.
Where is it made?
QA1 Pro Coil systems are made in the USA, 100 percent dyno tested and serialized.

