The QA1 Mustang Pro-Active System is the most advanced and complete bolt-on front suspension ever engineered for Mustang 5.0 / 4.6 racing applications. The Pro-Active System has it all – quality, performance and adjustability. Whether you are a weekend racer or Pro 5.0 driver, the QA1 Mustang Pro-Active System does it all.
The QA1 Mustang Pro-Active System includes:
Tubular K-Member, Coil-Over Conversion Kit, Tubular Control Arms, Caster/Camber Plates, Mustang Struts
Pro-Active System – Rod End Mounted Control Arms
Model Year Part No. Light Part No. Heavy
175 Lb. Springs 225 Lb. Springs
1979 – 1989 MU1LR MU1HR
1990 – 1993 MU2LR MU2HR
1994 – 1995 MU3LR MU3HR
1996 – 2004 MU4LR MU4HR
Pro-Active System – Bushing Mounted Control Arms
Model Year Part No. Light Part No. Heavy
175 lb. springs 225 lb. springs
1979 – 1989 MU1LB MU1HB
1990 – 1993 MU2LB MU2HB
1994 – 1995 MU3LB MU3HB
1996 – 2004 MU4LB MU4HB
TUBULAR K-MEMBERS •
QA1’s tubular K-members are designed from the ground up for weight savings, improved geometry and as a bolt-in swap for the factory K-member in race applications. May alter wheel base and stance.
• Bolt-In Design
All mounting points have been digitally indexed from new, factory K-members.
• Weight Savings
Up to 28 lbs. lighter than the factory K-members with increased strength by design.
• Increased Header Clearance
Header and oil pan clearance maximized for easier maintenance and installation.
• Modular Design for Versatility
Spring perches are removable for extra weight savings when using coil-overs kits. Stocks or aftermarket a-arms may be used.
• Improved Geometry
Bump steer, anti-dive and Ackerman angles have been improved for maximum performance.
MU1TK 1996 – 2004 Mustang 4.6
MU2TK 1979 – 1995 Mustang 5.0
TUBULAR CONTROL ARMS
Tubular control arms reduce unsprung weight while improving weight distribution in race applications. QA1 tubular control arms require the use of QA1 coil-over struts and QA1 caster/camber plates.
• Eco-Comp Control Arms
The Eco-Comp control arms are an economical choice in tubular arms for use on the strip. They are built with QA1’s exclusive compressed rubber bushings and engineered for performance. The Eco Comp’s offer value without sacrificing performance.
MU1ESA 1979 - 1993 Mustang 5.0
MU2ESA 1994 - 2004 Mustang 5.0/4.6
• Pro-Comp Control Arms
The QA1 Pro-Comp Control Arms are the ultimate in adjustability, design and strength. These arms utilize QA1’s exclusive XM series rod ends. These chrome moly, heat-treated rod ends use QA1’s exclusive Teflon®/Kevlar® lining for superior performance and durability. Included in the control arm kit are spacers to allow movement of the arms forward and rearward for the wheel base adjustment.
MU1TCA 1979 - 1993 Mustang 5.0
MU2TCA 1994 - 2004 Mustang 5.0/4.6
CASTER/CAMBER PLATES
QA1’s high quality caster/camber plates for race applications offer many features not found in other brands. For example, the bearing housing is tig-welded for the utmost in strength and durability. This kit provides caster and camber changes for the ultimate in adjustability.
CC100MU 1979 – 1989 Mustang 5.0
CC102MU 1990 – 1993 Mustang 5.0
CC104MU 1994 – 2004 Mustang 5.0/4.6
COIL-OVER CONVERSION KITS (Including Springs)
These kits only work with QA1 Mustang struts and require the use of QA1's caster/camber plates. Each kit includes (2) 2-pc. upper spring caps with bearings, (2) spring seats, (2) set screws, (2) washers and (2) springs.
MU150 - 150 lb springs
MU175 - 175 lb. springs
MU200 - 200 lb. springs
MU225 - 225 lb. springs
MU250 - 250 lb. springs
