| DYNO PROVEN TO PROVIDE THE LARGEST HORSEPOWER GAINS FOR YOUR 03-04 MACH I MUSTANG
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 STRATEGY
In keeping with our goal of providing our customers with the best possible value, we have tested a large group of components specifically designed for the 4.6L 4V Mod Motor.
We have invested many hours evaluating and refining each of the 4.6L products on our chassis “dyno”, to ensure that we could develop as much power as possible, as safely as possible.
The site menu on the left side of this page, lists the clear winners when it comes to “performance vs. dollar” value. Please check back often as we are always developing new ways to create more horsepower.
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Pro-Active Systems
96-04 Mustang GT/Mach-1
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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
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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.
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- 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-over kits. Stock or aftermarket a-arms can be used.
- Improved Geometry
Bump steer, anti-dive and Ackerman angles have been improved for
maximum performance. If car has been modified, may cause tire to
fender clearance issues.
- Mild Steel DOM Tubular Construction
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| Part # |
Year |
Application |
Price |
| QA1-MU4LB |
96-04 |
Pro-Active System – W/Bushing Mounted Control Arms- Part No. Light Part No. 175 lb. springs
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$ 1127.95 |
| QA1-MU4HB |
96-04 |
Pro-Active System – W/Bushing Mounted Control Arms- Part No. Heavy Part No. 225 lb. springs
|
$ 1127.95 |
| QA1-MU150 |
77-08 |
Coil-Over Conversion Kit (150 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 150 lb. springs.
|
$ 199.95 |
| QA1-MU175 |
77-08 |
Coil-Over Conversion Kit (175 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 175 lb. springs.
|
$ 199.95 |
| QA1-MU200 |
77-08 |
Coil-Over Conversion Kit (200 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 200 lb. springs.
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$ 199.95 |
| QA1-MU225 |
77-08 |
Coil-Over Conversion Kit (225 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 225 lb. springs.
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$ 199.95 |
| QA1-MU250 |
77-08 |
Coil-Over Conversion Kit (250 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 250 lb. springs.
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$ 199.95 |
| QA1-T114W |
79-04 |
QA-1 Spanner Wrench, Coil-Over Adjustment Tool - - Provides enough leverage to turn most spring seats
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$ 19.95 |
Click-On Price to Order
NOTE: All Pro-Active System have a $39.95 U.P.S. Heavy/Oversize package shipping fee.
QA-1 Struts & Shocks, Bump Steer Kits
QA-1 MUSTANG FRONT STRUTS (no sleeves required)
- 100% Aluminum Body
3 lbs. lighter (each) than any other strut available, precision machined for perfect piston
bore fit, black-hard anodized inside and out for incredible strength and durability, fully
threaded for easy coil-over conversion.
- Exceptional Piston Rod Design
Piston rod goes completely through the body and is supported on both ends for greater
strength and more consistent valving. Piston rod bind is eliminated.
- Externally Adjustable Valving
10 full sweeps of rebound valving. Changes are accomplished from under the hood for
easy access. One knob allows for quick and precise valving changes from street to
strip to road racing.
- Monotube Design
The large body and monotube design provide for the use of a larger piston and greater
fluid volume. More fluid means lower temperatures and the larger piston allows for
greater fluid control for more consistent valving.
- Easy Bolt-In Installation
The Mustang struts are a direct replacement for the factory struts. They can be used
with or without coil-over kits. |
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QA-1 MUSTANG STOCKER STAR® (rear) Shocks
With the 1979 to present Mustangs one of the most popular performance cars ever
built. QA1 has built a rear shock in the Stocker Star® line designed specifically for the
Fox, SN95 and S197 chassis, including the Cobras. The Mustang Stocker Star® rear
shock is built to handle it all, from drag and road racing to the rigors of everyday use.
With 576 valving options on the double adjustable shocks, and 12 valving options on the
single adjustable shocks, you can easily fine tune compression and rebound to
accomplish incredible performance. These shocks are revalveable and rebuildable.
QA-1 Mustang STOCKER STAR® Single Adjustable - 12 valving options
Simultaneous Compression and Rebound Adjustment
- 12 Valving Options, One knob changes both compression and rebound valving simultaneously, allowing total suspension control in one easy-to-reach location.
QA-1 Mustang STOCKER STAR® Double Adjustable – 576 valving options
Truly Independent Compression and Rebound Adjustment
- 576 Valving Options Includes 24 positions of compression adjustment on one knob, and 24 positions of rebound adjustment on the other knob. Each knob is clearly labeled for ease
of adjustment.
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QA-1 BUMP STEER KIT
Changing suspension components sometimes leads to bump steer or unwanted toe
change during suspension travel. Correct this problem with QA1’s new Bump Steer
Kit. This kit features QA1’s premium chromoly steel, heat treated, self-sealing and
self-lubricating X series rod ends and an aluminum anodized adjusting sleeve.
Easy installation.
QA-1 Bump Steer Kit contains: -
- (2) QA1 X series rod ends with jam nuts
- (2) Anodized aluminum adjusting sleeves with jam nuts
- (2) Special designed spindle studs (no drilling required) with washer and lock nut
- Assortment of bump steer spacers
*A qualified alignment shop should be used for final adjustment of all vehicle
suspension settings.
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| Part # |
Year |
Application |
Price |
| QA1-H2004 |
05-08 |
QA-1 Aluminum Body Front Strut – 10 full sweeps of rebound valving.- Designed without sway bar bracket *requirers QA1 camber plates
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$ 229.95 |
| QA1-H2005 |
05-08 |
QA-1 Aluminum Body Front Strut – 10 full sweeps of rebound valving.- Designed with sway bar bracket *requirers QA1 camber plates
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$ 269.95 |
| QA1-H2002 |
94-04 |
QA-1 Aluminum Body Front Strut – 10 full sweeps of rebound valving.- 2” Lowered Mustang 5.0/4.6L, including Cobra
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$ 229.95 |
| QA1-H2003 |
94-04 |
QA-1 Aluminum Body Front Strut – 10 full sweeps of rebound valving.- Mustang 5.0/4.6L, including Cobra
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$ 229.95 |
| QA1-MU7857P |
05-08 |
QA-1 Mustang Stocker Star® Rear Shock – Single Adjustable - - 2005 - present Mustangs & Shelby GT500 - 12 valving options
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$ 179.95 |
| QA1-MU7856P |
99-04 |
QA-1 Mustang Stocker Star® Rear Shock – Single Adjustable - - Mustang I.R.S. Mustang Cobras - 12 valving options
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$ 159.95 |
| QA1-MU7855P |
79-04 |
QA-1 Mustang Stocker Star® Rear Shock – Single Adjustable - - Mustang 5.0/4.6, including Cobras - 12 valving options
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$ 139.95 |
| QA1-DMU7857P |
05-08 |
QA-1 Mustang Stocker Star® Rear Shock – Double Adjustable - - 2005 - present Mustangs & Shelby GT500 - 576 valving options
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$ 399.95 |
| QA1-DMU7856P |
99-04 |
QA-1 Mustang Stocker Star® Rear Shock – Double Adjustable - - Mustang I.R.S. Mustang Cobras - 576 valving options
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$ 316.95 |
| QA1-DMU7855P |
79-04 |
QA-1 Mustang Stocker Star® Rear Shock – Double Adjustable - - Mustang 5.0/4.6, including Cobras - 576 valving options
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$ 299.95 |
| QA1-BAX105 |
05-08 |
QA-1 Mustang QA-1 Bump Steer Kit - - Including assortment of bump steer spacers
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$ 149.95 |
| QA1-BAX104 |
79-04 |
QA-1 Mustang QA-1 Bump Steer Kit - - Including assortment of bump steer spacers
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$ 149.95 |
Click-On Price to Order
QA-1 Caster/Camber Plates & Coil-Over Conversions
QA-1 Caster/Camber Plates Innovation At Its Best
Problem: Typical caster/camber plates use
a standard COM type bearing in the housing. This
bearing is not optimum for this type of application and
will usually wear and become sloppy in a short
amount of time.
Solution: QA1 once again leads the industry by
developing a specifically engineered asymmetric
bearing for caster/camber plate applications.
Through this innovative design, the bearing allows
for improved load distribution that significantly
reduces wear and increases durability eliminating
"sloppy bearings" which result in road noise and
poor handling characteristics.
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.
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QA-1 Coil-Over Conversion Kits
QA-1 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
Other Coil-Over Conversion Kits
These kits are the coil-over hardware for (2) QA1 Mustang struts.
MU1CCM - Spring caps, seats and washers only
MU1LSM - Spring seats and washers only
QA-1-T120W Spanner Wrench, Coil-Over Adjustment Tool.
An easy way to adjust your shocks.
This coil-over wrench fits most coil-over shocks. Provides enough leverage to turn most spring seats, and small enough to fit in your back pocket.
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| Part # |
Year |
Application |
Price |
| QA1-CC105MU |
05-08 |
QA-1 Caster/Camber Plates |
$ 189.95 |
| QA1-CC104MU |
94-04 |
QA-1 Caster/Camber Plates |
$ 159.95 |
| QA1-MU150 |
77-08 |
Coil-Over Conversion Kit (150 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 150 lb. springs.
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$ 199.95 |
| QA1-MU175 |
77-08 |
Coil-Over Conversion Kit (175 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 175 lb. springs.
|
$ 199.95 |
| QA1-MU200 |
77-08 |
Coil-Over Conversion Kit (200 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 200 lb. springs.
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$ 199.95 |
| QA1-MU225 |
77-08 |
Coil-Over Conversion Kit (225 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 225 lb. springs.
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$ 199.95 |
| QA1-MU250 |
77-08 |
Coil-Over Conversion Kit (250 lb. springs) – This kit only work with QA1 Mustang struts and require the use
of QA1's caster/camber plates.
This kit includes- (2) 2-pc. upper spring, caps with bearings, (2) spring seats
- (2) set screws, (2) washers
and (2) 250 lb. springs.
|
$ 199.95 |
| QA1-MU1CCM |
77-08 |
Coil-Over Conversion Kit (with-out springs) –
This kit only work with QA1 Mustang struts only- (2) Spring caps, seats and washers (only)
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$ 149.95 |
| QA1-MU1LSM |
77-08 |
Coil-Over Conversion Kit (with-out springs) –
This kit only work with QA1 Mustang struts only- (2) Spring seats and washers (only)
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$ 79.95 |
| QA1-T114W |
79-04 |
QA-1 Spanner Wrench, Coil-Over Adjustment Tool - - Provides enough leverage to turn most spring seats
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$ 19.95 |
Click-On Price to Order
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Aluminum Coolant, Steering Tanks 
Line-Loc / Brake Control Kits 
Synthetic Motor Oil / Gear Fluids 
Stainless Steel Hood Pin Kits 
85mm MAF System & TUREFLOW Pipe
Gen. II FIPK® Cold-Air Kit
Cleaning / Filter Kits 
Filters
POLISHED Twin 62mm Throttle Body
Twin 62mm-65mm Throttle Body Kits
80/85mm MAF/Adaptor Kit/Hoses
Performance Disc Brake Kits
Stainless Steel Brake Line Kits 
PREDATOR Flash Tuner 
LIVEWIRE/X3 Flash Tuners
Special Forces Tuning Software 
CORTEX Flash Tuner 
160º/180º LOW TEMP T/Stats
Aluminum Driveshaft Kits
Gear Sets, 3.73/4.10 Ratio
LAKEWOOD Driveshaft Safety Loop Kit
Rear End Girdle and Stud kit 
DYNO TUNED POWER OPTIONS™
Stage I/II/III Camshafts/Spring
Stage I/II/III Camshafts/Spring
SCREEN Windage Tray (+12 hp) 
1-¾ Header Kits
Ceramic Mid-length Headers
STAINLESS X-Pipe w/wo Cats
X-Pipe Kits w/wo Cats
True X-Pipe with/without cats
American Thunder Exhaust Kits
D-Pic Performance Info Meters
Wideband air/fuel with data-logger
Full A-Pillar, Pods, Clusters 
DIRECT-FIRE 3V Modular SuperCoils
FORD Blaster Coil-on-Plug 
Copper / Iridium Spark Plugs 
™ Nitrous Oxide Systems (35-175 hp)
NITROUS OXIDE Kit (75-175 hp)
Boost Coolers 
Tubular K-Member / Coil-Over Kits
PRO-KIT / SPORTLINE Spring Kits
Sub-frame Connectors
Drag Radials / Drag Slicks
Mustang Performance Shifters 
PRO RIPPER -and- HAMMER Shifters
DFX Series Clutch Kits
Street-Strip Clutch/Flywheel Kits
Street-Strip Clutch/Flywheel Kits
TCI Super Streetfighter Converters